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CD Images, scratches, and MP3s, OH MY!
Master_Scythe 
6/9/08 1:34:42 PM
Titan

Heres one to scratch the noggin over.

I want to backup my CDs. Ive been doing the Mp3 thing, and thats all well and good.

SCRATCH! *error correction in EAC* track comes out audiably fine. cool.

So I decide. Good, now i have my MP3s, i should do a PROPER backups of my CDs. eg. FLAC or CD IMAGES.

My preference is DEFINATELY cd images, however I have some confusion in my mind.

If a CD is scratched, and I image it, the image now has a 'scratch' can that be error corrected? because being a virtual CD, each 're-read' is going to come back the same.

Does the CD imaging process have error correction built in to fix the image in the first place?

Thats my only issue. If i use FLAC it can error correct as it backs up. But id preffer CD images, and as such, could i fuck up my backup forever by keeping a 'scratch' where I could have had FLAC re-read 20 times and averaged out a hopefully perfect sound.

Also some CDs have errors even though they're factory new, I suppose all do.

advice?

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4200+X2 939, ASUS A8N-SLI-D, Ati HD3850, 1gb,1tb total HDD, 109 DVD, LG DVD-rom.
Quote by Girvo
I've got a wicked tiny one that is ridiculously sensitive.



smadge1 
6/9/08 1:41:09 PM
Immortal

cd images don't store scratches, they store the data stored on the CD.

if the scratch is so bad that it can't be error corrected, all you will have is a corrupted or partially corrupted cd image.

FLAC may be the best way to go, because if the CDs are ripped with a CUE file, you can re-write the CD later with the exact same properties (ie, track order/length/gap between tracks etc)


Edited by smadge1: 6/9/2008 01:43:27 PM

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I broke my ass in a farting accident.
I have a bag of salty nuts.

[ .. The WHS Guy .. ]

http://geocline.net/
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Linux_Inside V2 
6/9/08 1:41:26 PM
Immortal

Error Correction doesn't pass the corrupt data to the OS AFAIK it's a hardware level thing that tries to retrieve the correct data, if it does it is then passed to the OS

Imaging a scratched CD won't produce a virtual scratched cd.

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Master_Scythe 
6/9/08 2:17:58 PM
Titan

OK cool.

So if the CD is too scratched to be imaged, it wont just image the fucked CD it'll fail?

EDIT: if this is the case, how come ripping MP3s from a certain CD spends an hour error correcting a track, while CD imaging detects no errors?


Edited by Master_Scythe: 6/9/2008 02:18:56 PM

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4200+X2 939, ASUS A8N-SLI-D, Ati HD3850, 1gb,1tb total HDD, 109 DVD, LG DVD-rom.
Quote by Girvo
I've got a wicked tiny one that is ridiculously sensitive.



Waltish 
7/9/08 6:51:07 AM
Hero
Titan


EAC has different levels of error correction, If you choose paranoid mode it can take a bloody long time to rip the CD.

That's because it does it to the point of checking and comparing every single " bit ".


Edited by Waltish: 7/9/2008 06:53:57 AM

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http://technology.timesonline.co.uk/tol/news/tech_and_web/article4472654.ece

Master_Scythe 
7/9/08 2:25:38 PM
Titan

where as.... CD imaging only checks, what?

ifit hits a scratch will it fail, so i know i need to polish the disk surface?

Mines (EAC) on 'Secure Mode' with 'accurate scream' and 'drive caches audio data'

yeah it took ages to rip a scrached and fucked CD last night, however its come out sounding perfect. So i dont complain.

thats what im wondering.

If I CD image. and the disk is damaged. can EAC still try to repair? or because its a 'virtual' CD, the 're-reads' it does, will always be the same and thusly not be able to 'average out' a nice sound between the errors.


EDIT: On a quest for multi=pass disk imaging software, as this will fix my worrys i assume

EDIT AGAIN: It'd probably just be easier to re-rip with EAC again using FLAC to know ive had error correction done, I dont think i have many CDs with data tracks anyway. nor do I want data tracks on my music CDs.


EDIT 3: AAANNNDDD EAC has a CD->IMG option... using its secure mode and error correction i assume.... *facepalm* back to your lives people. lol


Edited by Master_Scythe: 7/9/2008 2:50:10 PM

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4200+X2 939, ASUS A8N-SLI-D, Ati HD3850, 1gb,1tb total HDD, 109 DVD, LG DVD-rom.
Quote by Girvo
I've got a wicked tiny one that is ridiculously sensitive.



robzy 
7/9/08 3:11:36 PM
Hero
Immortal


Quote by Master_Scythe
EDIT 3: AAANNNDDD EAC has a CD->IMG option... using its secure mode and error correction i assume.... *facepalm* back to your lives people. lol


Haha.

Rob.

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עם ישראל חי

Master_Scythe 
7/9/08 5:04:18 PM
Titan

but alas, this just saves a WAV file wth a CUE sheet.

not a CD image.

I think EAC with FLAC will have to be the end result.
oh well.

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4200+X2 939, ASUS A8N-SLI-D, Ati HD3850, 1gb,1tb total HDD, 109 DVD, LG DVD-rom.
Quote by Girvo
I've got a wicked tiny one that is ridiculously sensitive.



Waltish 
8/9/08 1:23:06 AM
Hero
Titan


But from the scratch free wave you can burn a scratch free CD.
Use some kind of iso utility if you want to make an image.

I don't know which are the best but you could paste this [ iso utility ] into Google there are plenty of them {:))


Edited by Waltish: 8/9/2008 1:55:06 PM

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http://technology.timesonline.co.uk/tol/news/tech_and_web/article4472654.ece

Kimmo 
8/9/08 1:48:43 PM
Hero
Immortal


Quote by robzy
Quote by Master_Scythe
EDIT 3: AAANNNDDD EAC has a CD->IMG option... using its secure mode and error correction i assume.... *facepalm* back to your lives people. lol

Haha.

+1

I was just going to suggest making audio CDs from WAV rips if all else failed...

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SquallStrife 
8/9/08 4:35:33 PM
Titan

You don't make ISOs of audio CDs. ISO images contain a filesystem. You know, for files.

A cuesheet with a bunch of WAV or RAW files is the equivalent for an audio CD. Any single-file image of an audio CD will simply be a container for this.

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Q6600 @ 3.6GHz | 8800GTS | XP x64 | Vista HP x64 | OSX 10.5.4

Quote by TinBane
The ONLY fuel saving benefit of this product, is that the car expends less energy to accelerate, because your wallet is lighter.

Master_Scythe 
8/9/08 5:00:42 PM
Titan

what if the CD contains a data track?

either way for space reasons i think i'll have to fold and go with FLAC.

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4200+X2 939, ASUS A8N-SLI-D, Ati HD3850, 1gb,1tb total HDD, 109 DVD, LG DVD-rom.
Quote by Girvo
I've got a wicked tiny one that is ridiculously sensitive.



smadge1 
8/9/08 5:17:02 PM
Immortal

FLAC files and a Cue sheet can recreate the original CD.

-----

I broke my ass in a farting accident.
I have a bag of salty nuts.

[ .. The WHS Guy .. ]

http://geocline.net/
17938

SquallStrife 
8/9/08 8:35:02 PM
Titan

Quote by Master_Scythe
what if the CD contains a data track?



Then the data track gets added to the cuesheet as a BIN file, the data equivalent of a RAW audio file.

http://en.wikipedia.org/wiki/Cue_sheet_(computing)

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Q6600 @ 3.6GHz | 8800GTS | XP x64 | Vista HP x64 | OSX 10.5.4

Quote by TinBane
The ONLY fuel saving benefit of this product, is that the car expends less energy to accelerate, because your wallet is lighter.

Master_Scythe 
8/9/08 10:24:55 PM
Titan

OK then, sonds good!

so the method you describe, can EAC do this or is there a better program for the job?

it needs strong error correction as a lot of my CDs got fucked in the car.

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4200+X2 939, ASUS A8N-SLI-D, Ati HD3850, 1gb,1tb total HDD, 109 DVD, LG DVD-rom.
Quote by Girvo
I've got a wicked tiny one that is ridiculously sensitive.



SquallStrife 
8/9/08 10:46:39 PM
Titan

EAC probably can do it. I personally use CDex 1.7 ß2 because it's open source and does exactly the same thing (and on googling it, actually LOOKS pretty much the same as EAC).

Just google it, and/or search the app's help for "cuesheet".

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Q6600 @ 3.6GHz | 8800GTS | XP x64 | Vista HP x64 | OSX 10.5.4

Quote by TinBane
The ONLY fuel saving benefit of this product, is that the car expends less energy to accelerate, because your wallet is lighter.

_sentinel 
9/9/08 1:11:13 AM
Champion

I'll find you the hydrogenaudio guide I use to do this when I get home, tells ya everything you need to know.

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Easy chewy, those buttons are your friends

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