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Recovering FLAC's deleted from hard drive, deleted FLAC's and then recoverd turn out corrupted
eveafterdark
post Jan 20 2013, 19:43
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Hello everyone
some time ago I had - amongst other stuff - a part of my flac collection (ca. 200 gb) accidentally deleted from my external hard drive (don't ask how, I "experimented" with some drivers for my VAIO bluetooth and suddenly on opening one, I just noticed files being deleted - just saw as folders disappear one by one in the hard drive window, only managed to plug out the disk to limit my losses).
anyway, I bought a software which I used to recover photos, mp3's, videos in different formats, lots of kinds of other files/formats and the problem is with the flac files.
first of all, the recovery software sees all the flac's (and other lossless) as "probably overwritten." this is strange because for instance some of the albums were copied to the disk just before the deletion, and generally, this was just a storage disk, not much copy/cut/paste/delete/save was going on there, except from putting the stuff there once and for good.
of course, I know that some of the files must be overwritten, I mean, properly overwritten but my point is, some of the files can't just be overwritten (in terms of how saving on hd works). besides, inside the same music folders where the flacs appear corrupted, there's bunch of other files, like art work for example which are not corrupted and were recoverd completeley.
now, I don't know how about the recovery software seeing the FLAC (and other lossless) files as "probably overwritten" I asked that question to the manufacturer, but haven't got the answer.

SO, my question to you guys is: are FLACS,APE's etc prone to getting corrupted when deleted and recovered? (maybe because of how they're built - MD5, CRC - these are just my guesses) and therefore the damage is permanent? anyone had similiar experience? or is there a way to repair lossless files?

Some details on what I tried:
- any action in foobar (like opening such flac, veryfying integrity) just gives me :(Unsupported format or corrupted file)
- in dbpoweramp try to convert it to wave or test coversion: Information converting to Wave, md5 did not match decoded data, file is corrupt.
- in dbpoweramp try to convert it to flac: Error input channel count more than FLAC can handle. [clEncoder::BeginConversion]
- audio tester - 1 file scanned, 1 file failed: (LOST_SYNC @ 0m 00s); the same with FLAC TESTER.
- FLAC FRONTEND: even with the errors option ticked it says: Run-time error '75 path/file access error

also I opened the flacs (but only e few of them, because this is where chinesse begins to me ;-) and simply lost hope ) with hex editor looking for the flac sequence numbers but I couldn't find one proper sequence

I'll be happy to know if I'm just wasting my time
thx in advance
eveafterdark
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jkauff
post Jan 20 2013, 21:09
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I hope you recovered your files to another hard drive so you didn't overwrite portions of the old files with the recovered files. Also, if the FLACs were on your system drive, there's always the possibility that programs in memory were writing temp files to the disk, or the Windows swap file was writing to disk as you were doing your recovery. Hopefully, you still have the original CDs or can re-download the corrupted files.

Next step should be a trip to the nearest Staples. Buy a 3TB WD My Book for $150 and back up all your stuff externally.
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db1989
post Jan 20 2013, 21:18
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Glad to be of some help. Let us know how you get on!

QUOTE (jkauff @ Jan 20 2013, 20:09) *
I hope you recovered your files to another hard drive so you didn't overwrite portions of the old files with the recovered files.
Excellent point: thanks for catching that.

QUOTE
Also, if the FLACs were on your system drive, there's always the possibility that programs in memory were writing temp files to the disk, or the Windows swap file was writing to disk as you were doing your recovery.
I thought about this, but then I saw that the initial post identified the drive as external, and I donít believe Windows writes to such drives without explicit instruction; also, the newer reply confirms that the drive was (or at least was intended to be) used for storage only.

The seeming lack of reasons for the FLACs to have been overwritten, and the fact that the MKA files seem to have fared better (or not been damaged at all), are quite intriguing. My guess is there must be some reason, as FLAC as a compressed format does not have some peculiar shortcoming, or MKA some huge advantage, that would make the former so much more vulnerable to corruption.
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