[mythtv-users] recovery of files and filenames from ext4 partition

[Hika van den Hoven]

Hoi Mark,

Tuesday, February 17, 2015, 10:38:14 AM, you wrote:

> Just thought I would give a quick update on where I got to with my crashed
> hard disk.

> Testdisk worked quite well for me (thanks Doug). I had about 1.8TB of
> recordings on the drive. On the first pass Testdisk was able to recover 387
> of 498 missing recordings including one of two recordings that I really
> wanted (most things I really want get watched quickly after recording, the
> stuff that sits there for a long time tends to be well down the viewing
> order). The recordings were missing their file names and extensions but I
> wrote a script that checked the file size and the number of frames and
> matched those to the database to get the correct names back (I assumed
> everything was mpg because I only had recordings on the drive and I deleted
> everything less than a couple hundred MB because the preview png get
> regenerated automatically anyway).

> After doing a few more passes with Testdisk I got another 62 recordings back
> that also appear to be 100% intact (and the second of the two recordings I
> really wanted). I also got another 22 recordings where the filesize was
> correct but the frame count was off by a small amount so I am assuming there
> may be a small amount of corruption in those files, although I have not been
> able to pick it yet on the quick once-over I did.

> That left about 27 recordings completely toast. Testdisk is still actually
> working on the disk trying to read the faulty area's but it is really really
> slow at this stage, only getting about a single byte back about every 10hrs
> so it's pretty much done (there is about 75MB it is unable to read at last
> count which is down from about 100Mb at the start). I might let it run a
> little longer but figure at this stage there is nothing to be gained, the
> lost recordings are nothing that particularly concern me.

> The only other loss was a missed recording when the backend crashed and
> wouldn't reboot, other than that I would have gotten away unscathed.

> TL:DR - Testdisk did a great job recovering lost files from crashed hard
> disk.

Could you maybe create a wiki entry for future reference. With your
scripts etc.?


Tot mails,
  Hika                            mailto:hikavdh at gmail.com

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Zonder leven is er geen hoop
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