光驱偏移值对抓轨的实际影响

缘起

事情的起因是这张专辑：少女时代 - Genie (소원을 말해봐)。

我的好朋友 A 抓得一份目录号为 SMCD-186 的发行，另一位朋友 B 发布的另一份发行可以在这里（提取码：d09f）下载到。按照惯例，核对两份 Log 中的 ToC（相同）、峰值电平（相同）、音轨 CRC 等信息，前 1~5 轨都一模一样，但是最后一轨第 6 轨，CRC 有不同了。

CRC 不同意味着实际的音频数据有出入，于是我下载了 B 那份，因为和 A 连接性差，直接向他要来了第六轨，丢进 fb2k 看看 MD5，确实不同，那么不同在哪？都转成 WAV，扔到 EAC 的 WAV 比较工具里看看，得到了如下结果：

真的不同，那看看 ARDB 和 CTDB 怎么说，我要来了整份专辑，分别丢进 CUETools 检测，检测结果如下：

[CUETools log; Date: 2020/3/7 15:15:18; Version: 2.1.6]
[CTDB TOCID: w0a2VXd8j85of5cG9m3ByKY_csA-] found.
Track | CTDB Status
  1   | (130/132) Accurately ripped
  2   | (130/132) Accurately ripped
  3   | (130/132) Accurately ripped
  4   | (130/132) Accurately ripped
  5   | (130/132) Accurately ripped
  6   | (129/132) Accurately ripped
[AccurateRip ID: 00052afd-001b9788-3f052006] found.
Track   [  CRC   |   V2   ] Status
 01     [cca3c3de|50309fed] (23+29/60) Accurately ripped
 02     [e4791079|d04c0865] (23+31/62) Accurately ripped
 03     [256c2d95|715f6906] (23+31/62) Accurately ripped
 04     [069ced68|f3a3ee19] (23+31/62) Accurately ripped
 05     [4284c198|0ac1e0d9] (23+31/62) Accurately ripped
 06     [7da3ce29|904c5c88] (22+31/59) Accurately ripped
Offsetted by -1322:
 01     [7bbba076] (00/60) No match (V2 was not tested)
 02     [7c00b086] (00/62) No match (V2 was not tested)
 03     [be0dadb5] (00/62) No match (V2 was not tested)
 04     [08bcbae8] (00/62) No match (V2 was not tested)
 05     [d8391872] (00/62) No match (V2 was not tested)
 06     [d86ae7f7] (00/59) No match (V2 was not tested)
Offsetted by -634:
 01     [21a5136e] (00/60) No match (V2 was not tested)
 02     [9692ee2e] (00/62) No match (V2 was not tested)
 03     [7570aa61] (00/62) No match (V2 was not tested)
 04     [0170aee6] (00/62) No match (V2 was not tested)
 05     [42f39918] (00/62) No match (V2 was not tested)
 06     [6a6eacb4] (00/59) No match (V2 was not tested)
Offsetted by 12:
 01     [44190ed0] (00/60) No match (V2 was not tested)
 02     [7cd8fabc] (00/62) No match (V2 was not tested)
 03     [b8f7907f] (00/62) No match (V2 was not tested)
 04     [30957b02] (00/62) No match (V2 was not tested)
 05     [720fad1f] (00/62) No match (V2 was not tested)
 06     [5bb016d5] (00/59) No match (V2 was not tested)
Track Peak [ CRC32 ] [W/O NULL] [ LOG ]
– 100.0 [C1C0A371] [03B2A233]
01 100.0 [1C1C7F1A] [62B946B9] CRC32
02 100.0 [333C08B0] [2892567E] CRC32
03 100.0 [181B1DD9] [1A963B1D] CRC32
04 100.0 [093752F5] [BF1464C1] CRC32
05 100.0 [BC8F1D97] [EA233DAA] CRC32
06 100.0 [CBAFCA04] [2699FD79] CRC32

[CUETools log; Date: 2020/3/7 13:41:55; Version: 2.1.6]
[CTDB TOCID: w0a2VXd8j85of5cG9m3ByKY_csA-] found.
Track | CTDB Status
  1   | (130/132) Accurately ripped
  2   | (130/132) Accurately ripped
  3   | (130/132) Accurately ripped
  4   | (130/132) Accurately ripped
  5   | (130/132) Accurately ripped
  6   | (129/132) Accurately ripped
[AccurateRip ID: 00052afd-001b9788-3f052006] found.
Track   [  CRC   |   V2   ] Status
 01     [cca3c3de|50309fed] (23+29/60) Accurately ripped
 02     [e4791079|d04c0865] (23+31/62) Accurately ripped
 03     [256c2d95|715f6906] (23+31/62) Accurately ripped
 04     [069ced68|f3a3ee19] (23+31/62) Accurately ripped
 05     [4284c198|0ac1e0d9] (23+31/62) Accurately ripped
 06     [7da3ce29|904c5c88] (22+31/59) Accurately ripped
Offsetted by -1322:
 01     [7bbba076] (00/60) No match (V2 was not tested)
 02     [7c00b086] (00/62) No match (V2 was not tested)
 03     [be0dadb5] (00/62) No match (V2 was not tested)
 04     [08bcbae8] (00/62) No match (V2 was not tested)
 05     [d8391872] (00/62) No match (V2 was not tested)
 06     [d86ae7f7] (00/59) No match (V2 was not tested)
Offsetted by -634:
 01     [21a5136e] (00/60) No match (V2 was not tested)
 02     [9692ee2e] (00/62) No match (V2 was not tested)
 03     [7570aa61] (00/62) No match (V2 was not tested)
 04     [0170aee6] (00/62) No match (V2 was not tested)
 05     [42f39918] (00/62) No match (V2 was not tested)
 06     [6a6eacb4] (00/59) No match (V2 was not tested)
Offsetted by 12:
 01     [44190ed0] (00/60) No match (V2 was not tested)
 02     [7cd8fabc] (00/62) No match (V2 was not tested)
 03     [b8f7907f] (00/62) No match (V2 was not tested)
 04     [30957b02] (00/62) No match (V2 was not tested)
 05     [720fad1f] (00/62) No match (V2 was not tested)
 06     [5bb016d5] (00/59) No match (V2 was not tested)
Track Peak [ CRC32 ] [W/O NULL] [ LOG ]
– 100.0 [9B52F365] [056D7D9B]
01 100.0 [1C1C7F1A] [62B946B9] CRC32
02 100.0 [333C08B0] [2892567E] CRC32
03 100.0 [181B1DD9] [1A963B1D] CRC32
04 100.0 [093752F5] [BF1464C1] CRC32
05 100.0 [BC8F1D97] [EA233DAA] CRC32
06 100.0 [913D9A10] [87642E4F] CRC32

溯因

引人深省！为什么音频内容有实质性差异，还能拥有相同的 ARDB 和 CTDB ID？这意味着在两个数据库眼中，它们是完全相同的，而且都被视为准确地抓取了（Accurately ripped）。我要弄清这个问题。于是，我复习了既有知识，阅读到：

校验码算法会忽略第一个音轨开头的 2939 个采样（不到 5 块，略大于 0.013 秒的音频），也会忽略最后一个音轨末尾的 2940 个采样（正好 5 块）。截至 2011 年底，数据库中最大的光驱偏移值仅 1776 个采样，因此，经过偏移值校正的驱动器「踰读」到音频数据的边界之外时，通常不会影响校验码。但是，如果踰读了超过 2940 个采样，则该算法将假定数据已用数字静音填充（都是零）。如果你的驱动器无法踰读数据，且 DAE 软件未使用静音填充丢失的偏移采样，则你抓轨的校验码不太可能被提交到 AccurateRip 数据库或是与其中的记录比较。

https://wiki.hydrogenaud.io/index.php?title=AccurateRip

所以能匹配上是因为忽略了部分采样（这部分采样又能将差异采样涵盖掉），而其余的采样则完全相同，难怪可以拥有一致的数据库 ID。

探究

但我还想继续探究差异的细节。两者的差异集中在末尾的 0.015 秒这个区间内，我先看看有何不同。Au，启动！

我查看了两边第 6 轨末尾 0.186 秒的区间，结果如下：

确实不同，再看看波形（注意，这里我放大了波形，看右边的量尺。如不放大，是看不出这里存在音频内容的，当然，它们已经微不可闻了）：

可以看到 B 这份末尾明显少了一些内容，这些内容有多长？就是 EAC 的 WAV 比较工具指示的 0.015 秒，每秒 44100 采样，则 0.015 秒对应 661.5 采样，由于不会出现半个采样，存在少许误差，可以认为是 661 采样。我们再来看 Log：

Exact Audio Copy V1.3 from 2. September 2016
EAC extraction logfile from 10. June 2019, 21:03
Girls' Generation / Genie
Used drive : ASUS DRW-24B1ST j Adapter: 1 ID: 0
Read mode : Secure
Utilize accurate stream : Yes
Defeat audio cache : Yes
Make use of C2 pointers : No
Read offset correction : 6
Overread into Lead-In and Lead-Out : No
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Null samples used in CRC calculations : Yes
Used interface : Installed external ASPI interface
Gap handling : Appended to previous track
Used output format : User Defined Encoder
Selected bitrate : 896 kBit/s
Quality : High
Add ID3 tag : No
Command line compressor : C:\Program Files\Exact Audio Copy\Flac\flac.exe
Additional command line options : -8 -V -T “ARTIST=%artist%” -T “TITLE=%title%” -T “ALBUM=%albumtitle%” -T “DATE=%year%” -T “TRACKNUMBER=%tracknr%” -T “GENRE=%genre%” -T “PERFORMER=%albuminterpret%” -T “COMPOSER=%composer%” %haslyrics%–tag-from-file=LYRICS="%lyricsfile%"%haslyrics% -T “ALBUMARTIST=%albumartist%” -T “DISCNUMBER=%cdnumber%” -T “TOTALDISCS=%totalcds%” -T “TOTALTRACKS=%numtracks%” -T “COMMENT=%comment%” %source% -o %dest%
TOC of the extracted CD
 Track |   Start  |  Length  | Start sector | End sector
---------------------------------------------------------
    1  |  0:00.00 |  3:50.41 |         0    |    17290
    2  |  3:50.41 |  3:13.64 |     17291    |    31829
    3  |  7:04.30 |  3:19.15 |     31830    |    46769
    4  | 10:23.45 |  3:50.43 |     46770    |    64062
    5  | 14:14.13 |  3:36.58 |     64063    |    80320
    6  | 17:50.71 |  4:01.14 |     80321    |    98409

Track 1
 Filename C:\EAC Rips\Girls' Generation - Genie (2009) [FLAC]\01 - Genie.wav

 Pre-gap length  0:00:02.00

 Peak level 100.0 %
 Extraction speed 5.1 X
 Track quality 100.0 %
 Test CRC 1C1C7F1A
 Copy CRC 1C1C7F1A
 Accurately ripped (confidence 27)  [50309FED]  (AR v2)
 Copy OK

Track 2
 Filename C:\EAC Rips\Girls' Generation - Genie (2009) [FLAC]\02 - Etude.wav

 Pre-gap length  0:00:01.98

 Peak level 100.0 %
 Extraction speed 4.7 X
 Track quality 99.9 %
 Test CRC 333C08B0
 Copy CRC 333C08B0
 Accurately ripped (confidence 29)  [D04C0865]  (AR v2)
 Copy OK

Track 3
 Filename C:\EAC Rips\Girls' Generation - Genie (2009) [FLAC]\03 - Girlfriend.wav

 Pre-gap length  0:00:01.98

 Peak level 100.0 %
 Extraction speed 5.2 X
 Track quality 99.9 %
 Test CRC 181B1DD9
 Copy CRC 181B1DD9
 Accurately ripped (confidence 29)  [715F6906]  (AR v2)
 Copy OK

Track 4
 Filename C:\EAC Rips\Girls' Generation - Genie (2009) [FLAC]\04 - Boyfriend.wav

 Pre-gap length  0:00:01.98

 Peak level 100.0 %
 Extraction speed 6.5 X
 Track quality 100.0 %
 Test CRC 093752F5
 Copy CRC 093752F5
 Accurately ripped (confidence 29)  [F3A3EE19]  (AR v2)
 Copy OK

Track 5
 Filename C:\EAC Rips\Girls' Generation - Genie (2009) [FLAC]\05 - My Child.wav

 Pre-gap length  0:00:01.98

 Peak level 100.0 %
 Extraction speed 6.0 X
 Track quality 99.9 %
 Test CRC BC8F1D97
 Copy CRC BC8F1D97
 Accurately ripped (confidence 29)  [0AC1E0D9]  (AR v2)
 Copy OK

Track 6
 Filename C:\EAC Rips\Girls' Generation - Genie (2009) [FLAC]\06 - One Year Later.wav

 Pre-gap length  0:00:01.98

 Peak level 100.0 %
 Extraction speed 7.3 X
 Track quality 100.0 %
 Test CRC CBAFCA04
 Copy CRC CBAFCA04
 Accurately ripped (confidence 29)  [904C5C88]  (AR v2)
 Copy OK

All tracks accurately ripped
No errors occurred
End of status report
==== Log checksum 37C03F2F0C5C8DE510209AF37E84A6EFC0B4646E621FAE3DDEB6CB01819BFACE ====

Exact Audio Copy V0.99 prebeta 4 from 23. January 2008 EAC extraction logfile from 30. June 2009, 12:28 家赤矫措 (Girls Generation) / 家盔阑富秦毫 Used drive : HL-DT-STDVDRAM GSA-H42N Adapter: 3 ID: 0 Read mode : Secure Utilize accurate stream : Yes Defeat audio cache : Yes Make use of C2 pointers : No Read offset correction : 667 Overread into Lead-In and Lead-Out : No Fill up missing offset samples with silence : Yes Delete leading and trailing silent blocks : No Null samples used in CRC calculations : Yes Used interface : Native Win32 interface for Win NT & 2000 Gap handling : Appended to previous track Used output format : User Defined Encoder Selected bitrate : 128 kBit/s Quality : High Add ID3 tag : No Command line compressor : C:\Program Files\FLAC\flac.exe Additional command line options : -8 -V -T “ARTIST=%a” -T “TITLE=%t” -T “ALBUM=%g” -T “DATE=%y” -T “TRACKNUMBER=%n” -T “GENRE=%m” -T “COMMENT=EAC FLAC -8” %s TOC of the extracted CD Track | Start | Length | Start sector | End sector --------------------------------------------------------- 1 | 0:00.00 | 3:50.41 | 0 | 17290 2 | 3:50.41 | 3:13.64 | 17291 | 31829 3 | 7:04.30 | 3:19.15 | 31830 | 46769 4 | 10:23.45 | 3:50.43 | 46770 | 64062 5 | 14:14.13 | 3:36.58 | 64063 | 80320 6 | 17:50.71 | 4:01.14 | 80321 | 98409 Track 1 Filename E:\CD 赋俏\家赤矫措 (Girls Generation) - 家盔阑富秦毫\01 - 家盔阑富秦毫 (GENIE).wav Pre-gap length 0:00:02.00 Peak level 100.0 % Track quality 100.0 % Test CRC 1C1C7F1A Copy CRC 1C1C7F1A Track not present in AccurateRip database Copy OK Track 2 Filename E:\CD 赋俏\家赤矫措 (Girls Generation) - 家盔阑富秦毫\02 - ETUDE.wav Pre-gap length 0:00:01.74 Peak level 100.0 % Track quality 100.0 % Test CRC 333C08B0 Copy CRC 333C08B0 Track not present in AccurateRip database Copy OK Track 3 Filename E:\CD 赋俏\家赤矫措 (Girls Generation) - 家盔阑富秦毫\03 - 咯磊模备 (GIRLFRIEND).wav Pre-gap length 0:00:01.74 Peak level 100.0 % Track quality 100.0 % Test CRC 181B1DD9 Copy CRC 181B1DD9 Track not present in AccurateRip database Copy OK Track 4 Filename E:\CD 赋俏\家赤矫措 (Girls Generation) - 家盔阑富秦毫\04 - 巢磊模备 (BOYFRIEND).wav Pre-gap length 0:00:01.74 Peak level 100.0 % Track quality 100.0 % Test CRC 093752F5 Copy CRC 093752F5 Track not present in AccurateRip database Copy OK Track 5 Filename E:\CD 赋俏\家赤矫措 (Girls Generation) - 家盔阑富秦毫\05 - 悼拳 (MY CHILD).wav Pre-gap length 0:00:01.74 Peak level 100.0 % Track quality 100.0 % Test CRC BC8F1D97 Copy CRC BC8F1D97 Track not present in AccurateRip database Copy OK Track 6 Filename E:\CD 赋俏\家赤矫措 (Girls Generation) - 家盔阑富秦毫\06 - 1斥  (ONE YEAR LATER).wav Pre-gap length 0:00:01.74 Peak level 100.0 % Track quality 100.0 % Test CRC 913D9A10 Copy CRC 913D9A10 Track not present in AccurateRip database Copy OK None of the tracks are present in the AccurateRip database No errors occurred

End of status report

B 那份 Log 中偏移值是 667，A 这份则是 6，661 = 667 - 6。显然，这部分差异和两个不同光驱的偏移值有所关联。考虑到两份 Log 都没有开「通读到 Lead-In 和 Lead-Out」，意味着光驱跑进 Lead-Out 区域的时候就读不出东西来了，只能填充空采样，两者差了 661 采样，说明偏移 667 的光驱填充了 667 个空采样，偏移 6 的光驱填充了 6 个。

那么，「不同光驱按正确设置抓同一张碟所得数据完全相同」这句话就有一个限定条件了，那就是「误差范围内」。如果单论「逐位精确」，两者确实不同，但这个差异，是人完全察觉不了的，因为根据哈斯效应，两个声音要相差 0.035 秒以上才能有所感知，它相当于 1543 采样，已经是个很罕见的大值，更别说没有人会把两个偏移值不同的光驱抓轨放在一起比对着听，这就更难察觉差异了。但由此，也不妨得出一个结论，如果光驱本身没有「踰读（overread）」能力，EAC 中也没有开启此功能，则正偏移值越大，就有损失越多尾部采样的风险。

实验

上述的结论是我根据观察到的现象所做的合理猜测，下面就应当采用控制变量的实验来验证这个猜想。实验所采用的素材如下：

光驱：BENQ CDRW 52X32（具有踰读能力，偏移值 738）；
CD：doriko - 花束～the best of doriko feat. 初音ミク～；
设置：仅「驱动器选项…」→「偏移/速度」→「通读到 Lead-in 和 Lead-out」设置有变化，其余设置、操作流程完全一致。

实验结果：

踰读开启

Exact Audio Copy V1.3 from 2. September 2016
EAC extraction logfile from 25. July 2020, 16:50
doriko feat. 初音ミク / 花束
Used drive : ATAPI CDRW 52X32 Adapter: 1 ID: 0
Read mode : Secure
Utilize accurate stream : Yes
Defeat audio cache : Yes
Make use of C2 pointers : No
Read offset correction : 738
Overread into Lead-In and Lead-Out : Yes
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Null samples used in CRC calculations : Yes
Used interface : Native Win32 interface for Win NT & 2000
Gap handling : Appended to previous track
Used output format : User Defined Encoder
Selected bitrate : 1024 kBit/s
Quality : High
Add ID3 tag : No
Command line compressor : D:\Tools\FLAC\flac.exe
Additional command line options : -8 -e -p -V -T “ARTIST=%artist%” -T “TITLE=%title%” -T “ALBUM=%albumtitle%” -T “DATE=%year%” -T “TRACKNUMBER=%tracknr%” -T “GENRE=%genre%” -T “COMMENT=%comment%” -T “BAND=%albuminterpret%” -T “ALBUMARTIST=%albuminterpret%” -T “COMPOSER=%composer%” %haslyrics%–tag-from-file=LYRICS="%lyricsfile%"%haslyrics% -T “DISCNUMBER=%cdnumber%” -T “TOTALDISCS=%totalcds%” -T “TOTALTRACKS=%numtracks%” %hascover%–picture="%coverfile%"%hascover% %source% -o %dest%
TOC of the extracted CD
 Track |   Start  |  Length  | Start sector | End sector
---------------------------------------------------------
    1  |  0:00.00 |  3:37.72 |         0    |    16346
    2  |  3:37.72 |  4:41.20 |     16347    |    37441
    3  |  8:19.17 |  5:32.11 |     37442    |    62352
    4  | 13:51.28 |  4:04.48 |     62353    |    80700
    5  | 17:56.01 |  6:18.33 |     80701    |   109083
    6  | 24:14.34 |  5:00.66 |    109084    |   131649
    7  | 29:15.25 |  4:47.10 |    131650    |   153184
    8  | 34:02.35 |  4:52.50 |    153185    |   175134
    9  | 38:55.10 |  4:22.02 |    175135    |   194786
   10  | 43:17.12 |  4:07.47 |    194787    |   213358
   11  | 47:24.59 |  3:47.40 |    213359    |   230423
   12  | 51:12.24 |  4:16.09 |    230424    |   249632
   13  | 55:28.33 |  5:26.35 |    249633    |   274117
   14  | 60:54.68 |  5:21.19 |    274118    |   298211

Track 1
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\01. カクザトウ.wav

 Pre-gap length  0:00:02.00

 Peak level 95.2 %
 Extraction speed 7.1 X
 Track quality 100.0 %
 Test CRC 5B6D8A49
 Copy CRC 5B6D8A49
 Accurately ripped (confidence 23)  [5B52811C]  (AR v2)
 Copy OK

Track 2
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\02. ロミオとシンデレラ.wav

 Pre-gap length  0:00:01.36

 Peak level 100.0 %
 Extraction speed 8.3 X
 Track quality 100.0 %
 Test CRC E40C9396
 Copy CRC E40C9396
 Accurately ripped (confidence 24)  [2CFC096B]  (AR v2)
 Copy OK

Track 3
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\03. 歌に形はないけれど.wav

 Pre-gap length  0:00:02.36

 Peak level 97.7 %
 Extraction speed 8.6 X
 Track quality 100.0 %
 Test CRC F9131AE7
 Copy CRC F9131AE7
 Accurately ripped (confidence 24)  [309AEAAF]  (AR v2)
 Copy OK

Track 4
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\04. Shooting Star.wav

 Pre-gap length  0:00:02.36

 Peak level 100.0 %
 Extraction speed 9.8 X
 Track quality 100.0 %
 Test CRC 7A29C82B
 Copy CRC 7A29C82B
 Accurately ripped (confidence 24)  [7A696E69]  (AR v2)
 Copy OK

Track 5
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\05. 夕日坂.wav

 Pre-gap length  0:00:02.37

 Peak level 100.0 %
 Extraction speed 8.9 X
 Track quality 100.0 %
 Test CRC 7BD77CC3
 Copy CRC 7BD77CC3
 Accurately ripped (confidence 24)  [43D64D0F]  (AR v2)
 Copy OK

Track 6
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\06. Winter Alice.wav

 Pre-gap length  0:00:02.71

 Peak level 100.0 %
 Extraction speed 9.4 X
 Track quality 100.0 %
 Test CRC 1AA74D99
 Copy CRC 1AA74D99
 Accurately ripped (confidence 23)  [66AD2C30]  (AR v2)
 Copy OK

Track 7
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\07. キャットフード.wav

 Pre-gap length  0:00:01.72

 Peak level 100.0 %
 Extraction speed 8.0 X
 Track quality 99.9 %
 Test CRC 67C21FCB
 Copy CRC 67C21FCB
 Accurately ripped (confidence 23)  [9FFEB229]  (AR v2)
 Copy OK

Track 8
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\08. 飴か夢.wav

 Pre-gap length  0:00:02.37

 Peak level 100.0 %
 Extraction speed 10.0 X
 Track quality 100.0 %
 Test CRC A2E95F47
 Copy CRC A2E95F47
 Accurately ripped (confidence 23)  [9E0EB93C]  (AR v2)
 Copy OK

Track 9
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\09. 茜コントラスト.wav

 Pre-gap length  0:00:01.37

 Peak level 100.0 %
 Extraction speed 10.3 X
 Track quality 100.0 %
 Test CRC AB438991
 Copy CRC AB438991
 Accurately ripped (confidence 23)  [87E697B7]  (AR v2)
 Copy OK

Track 10
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\10. エトランゼ.wav

 Pre-gap length  0:00:02.01

 Peak level 96.2 %
 Extraction speed 9.0 X
 Track quality 99.9 %
 Test CRC 32E31D10
 Copy CRC 32E31D10
 Accurately ripped (confidence 23)  [49774466]  (AR v2)
 Copy OK

Track 11
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\11. モノクロアクト.wav

 Pre-gap length  0:00:02.37

 Peak level 100.0 %
 Extraction speed 11.0 X
 Track quality 100.0 %
 Test CRC 9FECC198
 Copy CRC 9FECC198
 Accurately ripped (confidence 24)  [A2468539]  (AR v2)
 Copy OK

Track 12
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\12. Reminiscence.wav

 Pre-gap length  0:00:02.37

 Peak level 100.0 %
 Extraction speed 10.8 X
 Track quality 100.0 %
 Test CRC E0435380
 Copy CRC E0435380
 Accurately ripped (confidence 23)  [48F9E26B]  (AR v2)
 Copy OK

Track 13
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\13. letter song.wav

 Pre-gap length  0:00:03.36

 Peak level 100.0 %
 Extraction speed 12.0 X
 Track quality 100.0 %
 Test CRC D00A3AF6
 Copy CRC D00A3AF6
 Accurately ripped (confidence 24)  [7D2617DB]  (AR v2)
 Copy OK

Track 14
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC]\14. bouquet.wav

 Pre-gap length  0:00:04.37

 Peak level 100.0 %
 Extraction speed 12.6 X
 Track quality 100.0 %
 Test CRC A701DB3C
 Copy CRC A701DB3C
 Accurately ripped (confidence 24)  [A5B4B8A1]  (AR v2)
 Copy OK

All tracks accurately ripped
No errors occurred
End of status report
—- CUETools DB Plugin V2.1.6
[CTDB TOCID: nUCM027l5Iece4glQ4I_rVg_95E-] found
Submit result: nUCM027l5Iece4glQ4I_rVg_95E- has been confirmed
Track | CTDB Status
1 | (91/93) Accurately ripped
2 | (91/93) Accurately ripped
3 | (91/93) Accurately ripped
4 | (91/93) Accurately ripped
5 | (91/93) Accurately ripped
6 | (90/93) Accurately ripped
7 | (90/93) Accurately ripped
8 | (90/93) Accurately ripped
9 | (91/93) Accurately ripped
10 | (91/93) Accurately ripped
11 | (91/93) Accurately ripped
12 | (91/93) Accurately ripped
13 | (90/93) Accurately ripped
14 | (93/93) Accurately ripped
==== Log checksum B4280693B3F5AC6BEFC6996A6E1D12C437DA8B0A0659528C0D1A758CE4FF6644 ====

踰读关闭

Exact Audio Copy V1.3 from 2. September 2016
EAC extraction logfile from 25. July 2020, 17:56
doriko feat. 初音ミク / 花束
Used drive : ATAPI CDRW 52X32 Adapter: 1 ID: 0
Read mode : Secure
Utilize accurate stream : Yes
Defeat audio cache : Yes
Make use of C2 pointers : No
Read offset correction : 738
Overread into Lead-In and Lead-Out : No
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Null samples used in CRC calculations : Yes
Used interface : Native Win32 interface for Win NT & 2000
Gap handling : Appended to previous track
Used output format : User Defined Encoder
Selected bitrate : 1024 kBit/s
Quality : High
Add ID3 tag : No
Command line compressor : D:\Tools\FLAC\flac.exe
Additional command line options : -8 -e -p -V -T “ARTIST=%artist%” -T “TITLE=%title%” -T “ALBUM=%albumtitle%” -T “DATE=%year%” -T “TRACKNUMBER=%tracknr%” -T “GENRE=%genre%” -T “COMMENT=%comment%” -T “BAND=%albuminterpret%” -T “ALBUMARTIST=%albuminterpret%” -T “COMPOSER=%composer%” %haslyrics%–tag-from-file=LYRICS="%lyricsfile%"%haslyrics% -T “DISCNUMBER=%cdnumber%” -T “TOTALDISCS=%totalcds%” -T “TOTALTRACKS=%numtracks%” %hascover%–picture="%coverfile%"%hascover% %source% -o %dest%
TOC of the extracted CD
 Track |   Start  |  Length  | Start sector | End sector
---------------------------------------------------------
    1  |  0:00.00 |  3:37.72 |         0    |    16346
    2  |  3:37.72 |  4:41.20 |     16347    |    37441
    3  |  8:19.17 |  5:32.11 |     37442    |    62352
    4  | 13:51.28 |  4:04.48 |     62353    |    80700
    5  | 17:56.01 |  6:18.33 |     80701    |   109083
    6  | 24:14.34 |  5:00.66 |    109084    |   131649
    7  | 29:15.25 |  4:47.10 |    131650    |   153184
    8  | 34:02.35 |  4:52.50 |    153185    |   175134
    9  | 38:55.10 |  4:22.02 |    175135    |   194786
   10  | 43:17.12 |  4:07.47 |    194787    |   213358
   11  | 47:24.59 |  3:47.40 |    213359    |   230423
   12  | 51:12.24 |  4:16.09 |    230424    |   249632
   13  | 55:28.33 |  5:26.35 |    249633    |   274117
   14  | 60:54.68 |  5:21.19 |    274118    |   298211

Track 1
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\01. カクザトウ.wav

 Pre-gap length  0:00:02.00

 Peak level 95.2 %
 Extraction speed 6.8 X
 Track quality 100.0 %
 Test CRC 5B6D8A49
 Copy CRC 5B6D8A49
 Accurately ripped (confidence 23)  [5B52811C]  (AR v2)
 Copy OK

Track 2
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\02. ロミオとシンデレラ.wav

 Pre-gap length  0:00:01.36

 Peak level 100.0 %
 Extraction speed 6.7 X
 Track quality 100.0 %
 Test CRC E40C9396
 Copy CRC E40C9396
 Accurately ripped (confidence 24)  [2CFC096B]  (AR v2)
 Copy OK

Track 3
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\03. 歌に形はないけれど.wav

 Pre-gap length  0:00:02.36

 Peak level 97.7 %
 Extraction speed 7.4 X
 Track quality 100.0 %
 Test CRC F9131AE7
 Copy CRC F9131AE7
 Accurately ripped (confidence 24)  [309AEAAF]  (AR v2)
 Copy OK

Track 4
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\04. Shooting Star.wav

 Pre-gap length  0:00:02.36

 Peak level 100.0 %
 Extraction speed 8.9 X
 Track quality 100.0 %
 Test CRC 7A29C82B
 Copy CRC 7A29C82B
 Accurately ripped (confidence 24)  [7A696E69]  (AR v2)
 Copy OK

Track 5
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\05. 夕日坂.wav

 Pre-gap length  0:00:02.37

 Peak level 100.0 %
 Extraction speed 8.4 X
 Track quality 100.0 %
 Test CRC 7BD77CC3
 Copy CRC 7BD77CC3
 Accurately ripped (confidence 24)  [43D64D0F]  (AR v2)
 Copy OK

Track 6
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\06. Winter Alice.wav

 Pre-gap length  0:00:02.71

 Peak level 100.0 %
 Extraction speed 10.2 X
 Track quality 100.0 %
 Test CRC 1AA74D99
 Copy CRC 1AA74D99
 Accurately ripped (confidence 23)  [66AD2C30]  (AR v2)
 Copy OK

Track 7
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\07. キャットフード.wav

 Pre-gap length  0:00:01.72

 Peak level 100.0 %
 Extraction speed 8.8 X
 Track quality 99.9 %
 Test CRC 67C21FCB
 Copy CRC 67C21FCB
 Accurately ripped (confidence 23)  [9FFEB229]  (AR v2)
 Copy OK

Track 8
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\08. 飴か夢.wav

 Pre-gap length  0:00:02.37

 Peak level 100.0 %
 Extraction speed 9.7 X
 Track quality 100.0 %
 Test CRC A2E95F47
 Copy CRC A2E95F47
 Accurately ripped (confidence 23)  [9E0EB93C]  (AR v2)
 Copy OK

Track 9
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\09. 茜コントラスト.wav

 Pre-gap length  0:00:01.37

 Peak level 100.0 %
 Extraction speed 10.8 X
 Track quality 100.0 %
 Test CRC AB438991
 Copy CRC AB438991
 Accurately ripped (confidence 23)  [87E697B7]  (AR v2)
 Copy OK

Track 10
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\10. エトランゼ.wav

 Pre-gap length  0:00:02.01

 Peak level 96.2 %
 Extraction speed 9.3 X
 Track quality 99.9 %
 Test CRC 32E31D10
 Copy CRC 32E31D10
 Accurately ripped (confidence 23)  [49774466]  (AR v2)
 Copy OK

Track 11
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\11. モノクロアクト.wav

 Pre-gap length  0:00:02.37

 Peak level 100.0 %
 Extraction speed 10.5 X
 Track quality 100.0 %
 Test CRC 9FECC198
 Copy CRC 9FECC198
 Accurately ripped (confidence 24)  [A2468539]  (AR v2)
 Copy OK

Track 12
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\12. Reminiscence.wav

 Pre-gap length  0:00:02.37

 Peak level 100.0 %
 Extraction speed 10.8 X
 Track quality 100.0 %
 Test CRC E0435380
 Copy CRC E0435380
 Accurately ripped (confidence 23)  [48F9E26B]  (AR v2)
 Copy OK

Track 13
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\13. letter song.wav

 Pre-gap length  0:00:03.36

 Peak level 100.0 %
 Extraction speed 11.3 X
 Track quality 100.0 %
 Test CRC D00A3AF6
 Copy CRC D00A3AF6
 Accurately ripped (confidence 24)  [7D2617DB]  (AR v2)
 Copy OK

Track 14
 Filename E:\EAC\doriko feat. 初音ミク - 花束 (2012) {dmARTS, DGSA-10031, CD} [FLAC] (对照组)\14. bouquet.wav

 Pre-gap length  0:00:04.37

 Peak level 100.0 %
 Extraction speed 11.8 X
 Track quality 100.0 %
 Test CRC 40696FCD
 Copy CRC 40696FCD
 Accurately ripped (confidence 24)  [A5B4B8A1]  (AR v2)
 Copy OK

All tracks accurately ripped
No errors occurred
End of status report
—- CUETools DB Plugin V2.1.6
[CTDB TOCID: nUCM027l5Iece4glQ4I_rVg_95E-] found
Submit result: already submitted
Track | CTDB Status
1 | (92/94) Accurately ripped
2 | (92/94) Accurately ripped
3 | (92/94) Accurately ripped
4 | (92/94) Accurately ripped
5 | (92/94) Accurately ripped
6 | (91/94) Accurately ripped
7 | (91/94) Accurately ripped
8 | (91/94) Accurately ripped
9 | (92/94) Accurately ripped
10 | (92/94) Accurately ripped
11 | (92/94) Accurately ripped
12 | (92/94) Accurately ripped
13 | (91/94) Accurately ripped
14 | (94/94) Accurately ripped
==== Log checksum FE54DD5585511333126756F230AF6E2054E4B72A92022318308279CF2A9D54D2 ====

在踰读开启的情况下，最后一轨的 CRC 为 A701DB3C；关闭时，最后一轨的 CRC 为 40696FCD，可见音频内容的确存在差异，两者的 MD5 分别为 B60D05BFA5474685DA7E491C67AF9BAC 和 28DC4021FC14D5A274FB44E956B3F62A。两者的 AR 校验码均为 A5B4B8A1，可见在计算时，AR 确实如前文所述，会忽略部分采样。下面两张图是最后一轨在 5:21.233~5:21.253（约 882 采样）区间的波形：

踰读开启

踰读关闭

请留意纵坐标，它被我放大了很多，本来上下两端默认的值是 0（也就是最响亮的满刻度），现在只有 -72，而音频更是低于满刻度值 78 dB 左右，人耳舒适上限为 70 dB，80 dB 是交通繁忙的闹市噪声水平。也就是说，虽然这里存在音频数据，但从响度来说，是可以将之视为静音的。

实验结果验证了我的假设：若不开踰读，或光驱不支持踰读，则正偏移值越大，丢失的尾部采样越多。除非音轨末尾这部分时间范围内本就是无须在意的纯静音。在尾部区间为毫无波动的纯静音条件下，是否开启踰读将无差别，见：

踰读开启

Exact Audio Copy V1.3 from 2. September 2016
EAC extraction logfile from 17. July 2020, 19:34
初音ミク vs 海賊王 × [TEST] / TwinTail・TwinGuitar
Used drive : ATAPI CDRW 52X32 Adapter: 1 ID: 0
Read mode : Secure
Utilize accurate stream : Yes
Defeat audio cache : Yes
Make use of C2 pointers : No
Read offset correction : 738
Overread into Lead-In and Lead-Out : Yes
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Null samples used in CRC calculations : Yes
Used interface : Native Win32 interface for Win NT & 2000
Gap handling : Appended to previous track
Used output format : User Defined Encoder
Selected bitrate : 1024 kBit/s
Quality : High
Add ID3 tag : No
Command line compressor : D:\Tools\FLAC\flac.exe
Additional command line options : -8 -e -p -V -T “ARTIST=%artist%” -T “TITLE=%title%” -T “ALBUM=%albumtitle%” -T “DATE=%year%” -T “TRACKNUMBER=%tracknr%” -T “GENRE=%genre%” -T “COMMENT=%comment%” -T “BAND=%albuminterpret%” -T “ALBUMARTIST=%albuminterpret%” -T “COMPOSER=%composer%” %haslyrics%–tag-from-file=LYRICS="%lyricsfile%"%haslyrics% -T “DISCNUMBER=%cdnumber%” -T “TOTALDISCS=%totalcds%” -T “TOTALTRACKS=%numtracks%” %hascover%–picture="%coverfile%"%hascover% %source% -o %dest%
TOC of the extracted CD
 Track |   Start  |  Length  | Start sector | End sector
---------------------------------------------------------
    1  |  0:00.00 |  1:59.46 |         0    |     8970
    2  |  1:59.46 |  4:15.30 |      8971    |    28125
    3  |  6:15.01 |  3:35.28 |     28126    |    44278
    4  |  9:50.29 |  4:34.68 |     44279    |    64896
    5  | 14:25.22 |  4:30.37 |     64897    |    85183
    6  | 18:55.59 |  3:56.04 |     85184    |   102887
    7  | 22:51.63 |  3:21.41 |    102888    |   118003
    8  | 26:13.29 |  4:08.28 |    118004    |   136631
    9  | 30:21.57 |  3:56.45 |    136632    |   154376
   10  | 34:18.27 |  3:36.48 |    154377    |   170624
   11  | 37:55.00 |  3:51.65 |    170625    |   188014
   12  | 41:46.65 |  3:32.11 |    188015    |   203925
   13  | 45:19.01 |  4:27.14 |    203926    |   223964
   14  | 49:46.15 |  3:49.09 |    223965    |   241148
   15  | 53:35.24 |  2:40.44 |    241149    |   253192

Track 1
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\01. サーチライト.wav

 Pre-gap length  0:00:02.00

 Peak level 99.9 %
 Extraction speed 5.5 X
 Track quality 100.0 %
 Test CRC 26E55EDB
 Copy CRC 26E55EDB
 Cannot be verified as accurate (confidence 2)  [283D0E6D], AccurateRip returned [AF1182E2]  (AR v2)
 Copy OK

Track 2
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\02. 千本桜.wav

 Peak level 100.0 %
 Extraction speed 5.9 X
 Track quality 100.0 %
 Test CRC 9F6704CB
 Copy CRC 9F6704CB
 Cannot be verified as accurate (confidence 2)  [9A7E5B22], AccurateRip returned [08B20DB1]  (AR v2)
 Copy OK

Track 3
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\03. ローリンガール.wav

 Peak level 100.0 %
 Extraction speed 7.0 X
 Track quality 100.0 %
 Test CRC 2F6CDB2D
 Copy CRC 2F6CDB2D
 Cannot be verified as accurate (confidence 2)  [DFBAFD90], AccurateRip returned [4B1FF9FC]  (AR v2)
 Copy OK

Track 4
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\04. 凪.wav

 Peak level 99.8 %
 Extraction speed 6.3 X
 Track quality 99.9 %
 Test CRC E0403123
 Copy CRC E0403123
 Cannot be verified as accurate (confidence 2)  [FE5108AB], AccurateRip returned [C7B070DB]  (AR v2)
 Copy OK

Track 5
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\05. リンネ.wav

 Peak level 100.0 %
 Extraction speed 8.0 X
 Track quality 100.0 %
 Test CRC 579CC6C8
 Copy CRC 579CC6C8
 Cannot be verified as accurate (confidence 2)  [33EA473B], AccurateRip returned [F42826F6]  (AR v2)
 Copy OK

Track 6
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\06. 才能シュレッダー.wav

 Peak level 100.0 %
 Extraction speed 7.1 X
 Track quality 99.9 %
 Test CRC 7CDBDC20
 Copy CRC 7CDBDC20
 Cannot be verified as accurate (confidence 2)  [3A4F54CA], AccurateRip returned [5A3F153B]  (AR v2)
 Copy OK

Track 7
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\07. in your sight.wav

 Peak level 100.0 %
 Extraction speed 8.4 X
 Track quality 100.0 %
 Test CRC CBF1DE9B
 Copy CRC CBF1DE9B
 Cannot be verified as accurate (confidence 2)  [D634A50F], AccurateRip returned [DDBCB6B0]  (AR v2)
 Copy OK

Track 8
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\08. Fleeting Reality.wav

 Peak level 100.0 %
 Extraction speed 8.4 X
 Track quality 100.0 %
 Test CRC 886DCF16
 Copy CRC 886DCF16
 Cannot be verified as accurate (confidence 2)  [A3018C45], AccurateRip returned [39DDE9B5]  (AR v2)
 Copy OK

Track 9
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\09. アフターナイト ワンダーランド.wav

 Peak level 100.0 %
 Extraction speed 9.3 X
 Track quality 100.0 %
 Test CRC 268B0914
 Copy CRC 268B0914
 Cannot be verified as accurate (confidence 2)  [22DC3825], AccurateRip returned [8EE9757D]  (AR v2)
 Copy OK

Track 10
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\10. Pilot Dance.wav

 Peak level 100.0 %
 Extraction speed 9.6 X
 Track quality 100.0 %
 Test CRC 1060899E
 Copy CRC 1060899E
 Cannot be verified as accurate (confidence 2)  [DBE99417], AccurateRip returned [0AE0A6E7]  (AR v2)
 Copy OK

Track 11
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\11. 未来線.wav

 Peak level 100.0 %
 Extraction speed 9.4 X
 Track quality 100.0 %
 Test CRC AD3F56B9
 Copy CRC AD3F56B9
 Cannot be verified as accurate (confidence 2)  [DBA75975], AccurateRip returned [4E1C2C3F]  (AR v2)
 Copy OK

Track 12
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\12. FREE TIME.wav

 Peak level 100.0 %
 Extraction speed 8.1 X
 Track quality 99.9 %
 Test CRC 9AF1FF3D
 Copy CRC 9AF1FF3D
 Cannot be verified as accurate (confidence 2)  [9AA7B9BD], AccurateRip returned [A23DD2A1]  (AR v2)
 Copy OK

Track 13
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\13. brand-new stardust.wav

 Peak level 100.0 %
 Extraction speed 9.8 X
 Track quality 100.0 %
 Test CRC 20B879FC
 Copy CRC 20B879FC
 Cannot be verified as accurate (confidence 2)  [7307BD4A], AccurateRip returned [43F03E34]  (AR v2)
 Copy OK

Track 14
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\14. 千本桜 -Acoustic Ver.-.wav

 Peak level 99.6 %
 Extraction speed 10.1 X
 Track quality 100.0 %
 Test CRC AFBF8C52
 Copy CRC AFBF8C52
 Cannot be verified as accurate (confidence 2)  [AA3C4821], AccurateRip returned [E17B0866]  (AR v2)
 Copy OK

Track 15
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\15. アフターナイト ワンダーランド -Acoustic Ver.-.wav

 Peak level 100.0 %
 Extraction speed 10.2 X
 Track quality 100.0 %
 Test CRC 6C84B57C
 Copy CRC 6C84B57C
 Cannot be verified as accurate (confidence 2)  [3DCD203A], AccurateRip returned [92A7BD1F]  (AR v2)
 Copy OK

No tracks could be verified as accurate
You may have a different pressing from the one(s) in the database
No errors occurred
End of status report
—- CUETools DB Plugin V2.1.6
[CTDB TOCID: C2HPpRThYLN1zwCxxsdpLEQBCXY-] found
Submit result: C2HPpRThYLN1zwCxxsdpLEQBCXY- has been confirmed
Track | CTDB Status
1 | (5/5) Accurately ripped
2 | (5/5) Accurately ripped
3 | (5/5) Accurately ripped
4 | (5/5) Accurately ripped
5 | (5/5) Accurately ripped
6 | (5/5) Accurately ripped
7 | (5/5) Accurately ripped
8 | (5/5) Accurately ripped
9 | (5/5) Accurately ripped
10 | (5/5) Accurately ripped
11 | (5/5) Accurately ripped
12 | (5/5) Accurately ripped
13 | (5/5) Accurately ripped
14 | (5/5) Accurately ripped
15 | (5/5) Accurately ripped
==== Log checksum 99D2D491CE0AFB6C2448142400D117D1FA543AF9EF83EF9CD9B8A528E0C9929B ====

踰读关闭

Exact Audio Copy V1.3 from 2. September 2016
EAC extraction logfile from 17. July 2020, 20:07
初音ミク vs 海賊王 × [TEST] / TwinTail・TwinGuitar
Used drive : ATAPI CDRW 52X32 Adapter: 1 ID: 0
Read mode : Secure
Utilize accurate stream : Yes
Defeat audio cache : Yes
Make use of C2 pointers : No
Read offset correction : 738
Overread into Lead-In and Lead-Out : No
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Null samples used in CRC calculations : Yes
Used interface : Native Win32 interface for Win NT & 2000
Gap handling : Appended to previous track
Used output format : User Defined Encoder
Selected bitrate : 1024 kBit/s
Quality : High
Add ID3 tag : No
Command line compressor : D:\Tools\FLAC\flac.exe
Additional command line options : -8 -e -p -V -T “ARTIST=%artist%” -T “TITLE=%title%” -T “ALBUM=%albumtitle%” -T “DATE=%year%” -T “TRACKNUMBER=%tracknr%” -T “GENRE=%genre%” -T “COMMENT=%comment%” -T “BAND=%albuminterpret%” -T “ALBUMARTIST=%albuminterpret%” -T “COMPOSER=%composer%” %haslyrics%–tag-from-file=LYRICS="%lyricsfile%"%haslyrics% -T “DISCNUMBER=%cdnumber%” -T “TOTALDISCS=%totalcds%” -T “TOTALTRACKS=%numtracks%” %hascover%–picture="%coverfile%"%hascover% %source% -o %dest%
TOC of the extracted CD
 Track |   Start  |  Length  | Start sector | End sector
---------------------------------------------------------
    1  |  0:00.00 |  1:59.46 |         0    |     8970
    2  |  1:59.46 |  4:15.30 |      8971    |    28125
    3  |  6:15.01 |  3:35.28 |     28126    |    44278
    4  |  9:50.29 |  4:34.68 |     44279    |    64896
    5  | 14:25.22 |  4:30.37 |     64897    |    85183
    6  | 18:55.59 |  3:56.04 |     85184    |   102887
    7  | 22:51.63 |  3:21.41 |    102888    |   118003
    8  | 26:13.29 |  4:08.28 |    118004    |   136631
    9  | 30:21.57 |  3:56.45 |    136632    |   154376
   10  | 34:18.27 |  3:36.48 |    154377    |   170624
   11  | 37:55.00 |  3:51.65 |    170625    |   188014
   12  | 41:46.65 |  3:32.11 |    188015    |   203925
   13  | 45:19.01 |  4:27.14 |    203926    |   223964
   14  | 49:46.15 |  3:49.09 |    223965    |   241148
   15  | 53:35.24 |  2:40.44 |    241149    |   253192

Track 1
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\01. サーチライト.wav

 Pre-gap length  0:00:02.00

 Peak level 99.9 %
 Extraction speed 3.5 X
 Track quality 100.0 %
 Test CRC 26E55EDB
 Copy CRC 26E55EDB
 Cannot be verified as accurate (confidence 2)  [283D0E6D], AccurateRip returned [AF1182E2]  (AR v2)
 Copy OK

Track 2
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\02. 千本桜.wav

 Peak level 100.0 %
 Extraction speed 3.5 X
 Track quality 100.0 %
 Test CRC 9F6704CB
 Copy CRC 9F6704CB
 Cannot be verified as accurate (confidence 2)  [9A7E5B22], AccurateRip returned [08B20DB1]  (AR v2)
 Copy OK

Track 3
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\03. ローリンガール.wav

 Peak level 100.0 %
 Extraction speed 3.7 X
 Track quality 100.0 %
 Test CRC 2F6CDB2D
 Copy CRC 2F6CDB2D
 Cannot be verified as accurate (confidence 2)  [DFBAFD90], AccurateRip returned [4B1FF9FC]  (AR v2)
 Copy OK

Track 4
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\04. 凪.wav

 Peak level 99.8 %
 Extraction speed 3.9 X
 Track quality 99.9 %
 Test CRC E0403123
 Copy CRC E0403123
 Cannot be verified as accurate (confidence 2)  [FE5108AB], AccurateRip returned [C7B070DB]  (AR v2)
 Copy OK

Track 5
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\05. リンネ.wav

 Peak level 100.0 %
 Extraction speed 4.2 X
 Track quality 100.0 %
 Test CRC 579CC6C8
 Copy CRC 579CC6C8
 Cannot be verified as accurate (confidence 2)  [33EA473B], AccurateRip returned [F42826F6]  (AR v2)
 Copy OK

Track 6
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\06. 才能シュレッダー.wav

 Peak level 100.0 %
 Extraction speed 3.9 X
 Track quality 99.9 %
 Test CRC 7CDBDC20
 Copy CRC 7CDBDC20
 Cannot be verified as accurate (confidence 2)  [3A4F54CA], AccurateRip returned [5A3F153B]  (AR v2)
 Copy OK

Track 7
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\07. in your sight.wav

 Peak level 100.0 %
 Extraction speed 4.4 X
 Track quality 100.0 %
 Test CRC CBF1DE9B
 Copy CRC CBF1DE9B
 Cannot be verified as accurate (confidence 2)  [D634A50F], AccurateRip returned [DDBCB6B0]  (AR v2)
 Copy OK

Track 8
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\08. Fleeting Reality.wav

 Peak level 100.0 %
 Extraction speed 4.2 X
 Track quality 100.0 %
 Test CRC 886DCF16
 Copy CRC 886DCF16
 Cannot be verified as accurate (confidence 2)  [A3018C45], AccurateRip returned [39DDE9B5]  (AR v2)
 Copy OK

Track 9
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\09. アフターナイト ワンダーランド.wav

 Peak level 100.0 %
 Extraction speed 5.3 X
 Track quality 100.0 %
 Test CRC 268B0914
 Copy CRC 268B0914
 Cannot be verified as accurate (confidence 2)  [22DC3825], AccurateRip returned [8EE9757D]  (AR v2)
 Copy OK

Track 10
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\10. Pilot Dance.wav

 Peak level 100.0 %
 Extraction speed 3.4 X
 Track quality 100.0 %
 Test CRC 1060899E
 Copy CRC 1060899E
 Cannot be verified as accurate (confidence 2)  [DBE99417], AccurateRip returned [0AE0A6E7]  (AR v2)
 Copy OK

Track 11
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\11. 未来線.wav

 Peak level 100.0 %
 Extraction speed 3.7 X
 Track quality 100.0 %
 Test CRC AD3F56B9
 Copy CRC AD3F56B9
 Cannot be verified as accurate (confidence 2)  [DBA75975], AccurateRip returned [4E1C2C3F]  (AR v2)
 Copy OK

Track 12
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\12. FREE TIME.wav

 Peak level 100.0 %
 Extraction speed 3.0 X
 Track quality 99.9 %
 Test CRC 9AF1FF3D
 Copy CRC 9AF1FF3D
 Cannot be verified as accurate (confidence 2)  [9AA7B9BD], AccurateRip returned [A23DD2A1]  (AR v2)
 Copy OK

Track 13
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\13. brand-new stardust.wav

 Peak level 100.0 %
 Extraction speed 3.8 X
 Track quality 100.0 %
 Test CRC 20B879FC
 Copy CRC 20B879FC
 Cannot be verified as accurate (confidence 2)  [7307BD4A], AccurateRip returned [43F03E34]  (AR v2)
 Copy OK

Track 14
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\14. 千本桜 -Acoustic Ver.-.wav

 Peak level 99.6 %
 Extraction speed 4.5 X
 Track quality 100.0 %
 Test CRC AFBF8C52
 Copy CRC AFBF8C52
 Cannot be verified as accurate (confidence 2)  [AA3C4821], AccurateRip returned [E17B0866]  (AR v2)
 Copy OK

Track 15
 Filename E:\EAC\初音ミク vs 海賊王 × [TEST] - TwinTail・TwinGuitar (2012) {Royal Records, YZSM-10003, CD} [FLAC]\15. アフターナイト ワンダーランド -Acoustic Ver.-.wav

 Peak level 100.0 %
 Extraction speed 3.4 X
 Track quality 100.0 %
 Test CRC 6C84B57C
 Copy CRC 6C84B57C
 Cannot be verified as accurate (confidence 2)  [3DCD203A], AccurateRip returned [92A7BD1F]  (AR v2)
 Copy OK

No tracks could be verified as accurate
You may have a different pressing from the one(s) in the database
No errors occurred
End of status report
—- CUETools DB Plugin V2.1.6
[CTDB TOCID: C2HPpRThYLN1zwCxxsdpLEQBCXY-] found
Submit result: already submitted
Track | CTDB Status
1 | (6/6) Accurately ripped
2 | (6/6) Accurately ripped
3 | (6/6) Accurately ripped
4 | (6/6) Accurately ripped
5 | (6/6) Accurately ripped
6 | (6/6) Accurately ripped
7 | (6/6) Accurately ripped
8 | (6/6) Accurately ripped
9 | (6/6) Accurately ripped
10 | (6/6) Accurately ripped
11 | (6/6) Accurately ripped
12 | (6/6) Accurately ripped
13 | (6/6) Accurately ripped
14 | (6/6) Accurately ripped
15 | (6/6) Accurately ripped
==== Log checksum 393E54DEFC68D5F817B1C0A14F36ADE00AE205382B4C814F585FD8B5511E5F18 ====

结论

那么，光驱的踰读能力和是否开启重要吗？答案是不重要，原因如下：

ARDB、CTDB 数据库在设计时就考虑到这个问题并加以规避了；
有的 CD 在这一区间是纯静音，意味着有无踰读毫无差别；
即使踰读与否产生了实质性音频内容差异，考虑其响度和时长，人类是无法感知的。