Consistency of errors?

[pipetman]

Having ripped quite a few CDs from my collection now, I have come across quite a few disks, where most tracks were flagged "Accurate", but some were just "Secure". I re-ripped those on two other drives and came up with the exact same results (and matching CRCs) - which made me wonder about the reproducibility of CD errors on different drives.

If there is a defect (scratch etc.) on a CD, that causes an error, will this error be consistent and reproducible between different drives? So, will I necessarily end up with the same results when re-ripping my CDs?

Also, from what I've been reading here about AccurateRip, it seems, that a "different pressing" produces non-matching CRCs for all tracks of an CD. Is it also possible, that only some tracks don't match, if the pressing is different (that is what I'm seeing for many of my CDs)? Or are above mentioned - potentially consistent - errors more the more likely cause?

[Spoon]

Re: Consistency of errors?

It is thought that different drive models would not return the same errors.

>Is it also possible, that only some tracks don't match,

It is difficult to say, you would have to post the drive models, wether c2 is being used, drive cache size.

[pipetman]

Re: Consistency of errors?

It is thought that different drive models would not return the same errors.

That's actually very reassuring and makes me a lot more confident about the quality of my rips.

It makes me scratch my head about some of those AccurateRip results, though... (as stated above, I get quite a few "Secure" rips mixed in with "Accurate" ones - a lot of my CDs are older German pressings, though, that might not exactly match what is available in the US).

Below, I have posted the settings for all the drives I use (with the Sony (no. 2) usually being the most reliable of the bunch).

-----
Ripping with drive 'D: [MATSHITA - UJDA775 DVD/CDRW]', Drive offset: 102, Overread Lead-in/out: No
AccurateRip: Active, Using C2: No, Cache: 75 KB, FUA Cache Invalidate: No
Pass 1 Drive Speed: Max, Pass 2 Drive Speed: Max
Ultra:: Vary Drive Speed: No, Min Passes: 3, Max Passes: 6, Finish After Clean Passes: 2
Bad Sector Re-rip:: Drive Speed: Max, Maximum Re-reads: 34
-----
Ripping with drive 'D: [SONY - DVD RW DW-D22A ]', Drive offset: 12, Overread Lead-in/out: No
AccurateRip: Active, Using C2: Yes, Cache: 1148 KB, FUA Cache Invalidate: No
Pass 1 Drive Speed: Max, Pass 2 Drive Speed: Max
Ultra:: Vary Drive Speed: Yes, Min Passes: 3, Max Passes: 6, Finish After Clean Passes: 2
Bad Sector Re-rip:: Drive Speed: Max, Maximum Re-reads: 34
-----
Ripping with drive 'F: [TSSTcorp - CDW/DVD TS-L462A]', Drive offset: 6, Overread Lead-in/out: No
AccurateRip: Active, Using C2: Yes, Cache: 1024 KB, FUA Cache Invalidate: No
Pass 1 Drive Speed: Max, Pass 2 Drive Speed: Max
Ultra:: Vary Drive Speed: Yes, Min Passes: 3, Max Passes: 6, Finish After Clean Passes: 2
Bad Sector Re-rip:: Drive Speed: Max, Maximum Re-reads: 34

[Spoon]

Re: Consistency of errors?

And what were the confidences shown on a rip where some were accurate and some were not?

[pipetman]

Re: Consistency of errors?

Typically confidence is 2 (or sometimes 3).

Here's an example - the most peculiar so far - where "Accurate" vs "Secure" is around 50/50:

dBpoweramp Release 13 Digital Audio Extraction Log from Monday, July 28, 2008 11:24 AM

Drive & Settings
----------------

Ripping with drive 'D:   [SONY     - DVD RW DW-D22A  ]',  Drive offset: 12,  Overread Lead-in/out: No
AccurateRip: Active,  Using C2: Yes,  Cache: 1148 KB,  FUA Cache Invalidate: No
Pass 1 Drive Speed: Max,  Pass 2 Drive Speed: Max
Ultra::  Vary Drive Speed: Yes,  Min Passes: 3,  Max Passes: 6,  Finish After Clean Passes: 2
Bad Sector Re-rip::  Drive Speed: Max,  Maximum Re-reads: 34

Encoder: FLAC -compression-level-5

Extraction Log
--------------

Track 1:  Ripped LBA 33 to 30220 (6:42) in 3:35. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\01-Symphony No. 81 in G major, Vivace.flac
  Secure  [Pass 1, Ultra 1 to 3]
  CRC32: 1B801B70     AccurateRip CRC: 190AB8C9     [DiscID: 009-0012178a-0082c7d8-800bc509-1]

Track 2:  Ripped LBA 30220 to 65408 (7:49) in 0:23. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\02-Symphony No. 81 in G major, Andante.flac
  AccurateRip: Accurate (confidence 2)     [Pass 1]
  CRC32: 406AEAD8     AccurateRip CRC: 3E004FAD     [DiscID: 009-0012178a-0082c7d8-800bc509-2]

Track 3:  Ripped LBA 65408 to 82333 (3:45) in 0:10. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\03-Symphony No. 81 in G major, Menuetto. Allegretto.flac
  AccurateRip: Accurate (confidence 2)     [Pass 1]
  CRC32: 0743824F     AccurateRip CRC: A796B204     [DiscID: 009-0012178a-0082c7d8-800bc509-3]

Track 4:  Ripped LBA 82333 to 102858 (4:33) in 2:20. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\04-Symphony No. 81 in G major, Finale. Allegro, ma non troppo.flac
  Secure  [Pass 1, Ultra 1 to 3]
  CRC32: 6A06CE40     AccurateRip CRC: 431835EF     [DiscID: 009-0012178a-0082c7d8-800bc509-4]

Track 5:  Ripped LBA 102858 to 126908 (5:20) in 0:12. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\05-Symphony in F sharp minor No. 45 (Farewell), Allegro assai.flac
  AccurateRip: Accurate (confidence 2)     [Pass 1]
  CRC32: E0224FED     AccurateRip CRC: E72D8994     [DiscID: 009-0012178a-0082c7d8-800bc509-5]

Track 6:  Ripped LBA 126908 to 165583 (8:35) in 4:18. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\06-Symphony in F sharp minor No. 45 (Farewell),  Adagio.flac
  Secure  [Pass 1, Ultra 1 to 3]
  CRC32: 82E58017     AccurateRip CRC: 754ADDA6     [DiscID: 009-0012178a-0082c7d8-800bc509-6]

Track 7:  Ripped LBA 165583 to 186970 (4:45) in 0:09. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\07-Symphony in F sharp minor No. 45 (Farewell),  Menuet. Allegretto.flac
  AccurateRip: Accurate (confidence 2)     [Pass 1]
  CRC32: 656D396F     AccurateRip CRC: F0EAAEDE     [DiscID: 009-0012178a-0082c7d8-800bc509-7]

Track 8:  Ripped LBA 186970 to 199378 (2:45) in 1:24. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\08-Symphony in F sharp minor No. 45 (Farewell),  Finale. Presto.flac
  Secure  [Pass 1, Ultra 1 to 3]
  CRC32: 938A27B5     AccurateRip CRC: 9A69A182     [DiscID: 009-0012178a-0082c7d8-800bc509-8]

Track 9:  Ripped LBA 199378 to 225983 (5:54) in 2:57. Filename: c:\temp\Franz Joseph Haydn\Symphonies Nos.45  & 81 - Orpheus Chamber Orchestra\09-Symphony in F sharp minor No. 45 (Farewell),  Adagio.flac
  Secure  [Pass 1, Ultra 1 to 3]
  CRC32: 63208441     AccurateRip CRC: FA2BB33B     [DiscID: 009-0012178a-0082c7d8-800bc509-9]

--------------

9 Tracks Ripped: 4 Accurate, 5 Secure

[Spoon]

Re: Consistency of errors?

A confidence of 2 is quite low and adds doubt to the validity in this instance, if it was 4 or 6 then there would be no doubt.