MP3 files and fragmentation

Using PhotoRec to recover lost data
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fabml
Posts: 3
Joined: 02 Feb 2019, 21:40

MP3 files and fragmentation

#1 Post by fabml » 02 Feb 2019, 21:45

Hi,
I'm using Photorec to recover a big number of MP3 files. They are stored in a drive that has not heavy fragmentation, but I think that it is unavoidable. So what happens when a file is fragmented? Will the file be incomplete or will it contain a piece of the contiguous file? They are very long files and I can't listen them individually.
Can I know which file is incomplete or not recovered by report.xml file?

Thank you for the support and for this great software.

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cgrenier
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Re: MP3 files and fragmentation

#2 Post by cgrenier » 03 Feb 2019, 10:53

mp3 is a streaming file format, so PhotoRec can not see the difference between a truncated music or the whole music.
If photorec recovers 3 mp3 files for a single music, you can play them in succession or even concat them together (Under Windows: type file1.mp3 file2.mp3 file3.mp3 > music.mp3)

fabml
Posts: 3
Joined: 02 Feb 2019, 21:40

Re: MP3 files and fragmentation

#3 Post by fabml » 04 Feb 2019, 18:36

Thank you for the answers.
I'm worried about the eventuality that a file could contain a piece of another audio file. For example, if we have two files (a.mp3, b.mp3) and some a.mp3's fragment is written AFTER b.mp3 starting, but before its ending, a.mp3 will be truncated or will contain b.mp3 pieces?
In my situation, I can compare file sizes (but I can't perform an MD5 comparison): Same size and playable file could mean that the file is ok?

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