unrar x : broken volume parts. How to fix/skip them to unpack ?
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It don't think there's any easy way to recover your info. Overall if you are using solid and/or encrypted rar archives (I don't know if that option still exist or anything, I stay as far from proprietary formats as I can).
Are there parity files associated with them or a recovery volume?
Look at the "rar --help" output and the rar.txt file that came with the package.
From the rar.txt file:
r Repair archive. Archive repairing is performed in two stages.
First, the damaged archive is searched for a recovery record
(see 'rr' command). If the archive contains a recovery record
and if the portion of the damaged data is continuous and less
than N*512 bytes, where N is number of recovery sectors placed
into the archive, the chance of successful archive
reconstruction is very high. When this stage has been completed,
a new archive will be created, called fixed.arcname.rar,
where 'arcname' is the original (damaged) archive name.
If a broken archive does not contain a recovery record or if
the archive is not completely recovered due to major damage, a
second stage is performed. During this stage only the archive
structure is reconstructed and it is impossible to recover
files which fail the CRC validation, it is still possible,
however, to recover undamaged files, which were inaccessible
due to the broken archive structure. Mostly this is useful
for non-solid archives.
When the second stage is completed, the reconstructed archive
will be saved as rebuilt.arcname.rar, where 'arcname' is
the original archive name.