Strange Patterns in recovered Photos

Using PhotoRec to recover lost data
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Joined: 15 Jan 2018, 13:56

Strange Patterns in recovered Photos

#1 Post by AahzChi » 15 Jan 2018, 14:26

I am trying to rescue data from an internal SSD that was the main drive in a MacBook. It is formatted as HFS+.
The MacOS broke down, but the SSD is still accessible. However there seems to be an error, so some folders and files produce I/O errors. I tried to use photorec to receive many baby and family pictures.
But only small files can be recovered properly. As soon as ca. 500kB per file are surpassed, some errorneous blocks are introduced. I attached a picture( ... G_8203.JPG). I also looked at the hex code and see some repeating patterns in the following form:
0 - 0d6000: normal image code
0d6000 - 0f6000: Only zeroes
0f6000 - 1d6000 : normal image code
1d6000 - 1f6000:Only zeroes
1f6000 - 2d6000 : normal image code
2d6000 - 2f6000: Only zeroes
and so on.
Why is it so regular? Can I somehow repair it? Can I change some options in photorec or of the partition with testdisk, so this does not happen?
I am happy for every suggestion.

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Re: Strange Patterns in recovered Photos

#2 Post by cgrenier » 18 Jan 2018, 18:33

I have removed all zone that were zeros filed, it doesn't fix the file. It looks like the zones with all the zero are zones with missing/unreadable data.
Some data recovery company are specialized in recovery from flash, they may help.

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