How to set up custom signatures to recover file.7z.001, file.7z.002, ..., file.7z.0??

Using PhotoRec to recover lost data
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min2max
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How to set up custom signatures to recover file.7z.001, file.7z.002, ..., file.7z.0??

#1 Post by min2max » 26 Aug 2016, 00:41

I have a bunch of system backup files compressed using 7z with file size set in 1GB like backup.7z.001, backup.7z.002, ..., backup.7z.0??, i.e. these backup 7z files were created by 7z command:

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7z a -v1000m backup.7z backup
on Ubuntu Linux so that all of these files are the 1GB breakup of 7z file. However when I tried to use PhotoRec to recover these deleted backup files, PhotoRec doesn't recognize these extensions in 001, 002, ..., 0?? during its scanning the hard drive. I also tried to create a custom signature file photorec.sig for these extensions, but it doesn't work either. My question is what is the correct format to create a custom signature file for these extensions in .001, 002, ..., and so on, so that PhotoRec can recognize these extensions when scanning the hard drive? Thanks for any clue.

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cgrenier
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Re: How to set up custom signatures to recover file.7z.001, file.7z.002, ..., file.7z.0??

#2 Post by cgrenier » 26 Aug 2016, 17:42

PhotoRec should recover .7z and .7z.001 with .7z extension.
Other .7x.* do not have constant/magic values that can be used to identify them, PhotoRec can't recover them.

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