Looking to read past EOT on DDS/DLT/LTO
Maciej W. Rozycki
macro at linux-mips.org
Thu Jan 26 12:23:00 CST 2017
On Wed, 25 Jan 2017, Nico de Jong wrote:
> I did some research, and the most reasonable outcome was that it was not
> possible by normal means, because some algorithm reading synchronisation
> data couldnt find out what was happening, so, the backup was ruined.....
Odd. This would imply you couldn't wind a tape past a medium error and
read what's behind, but I surely did it a couple of times with DDS tapes.
And this is exactly why I gave up on some proprietary (OSF/1 IIRC) `dump'
utility as it recorded an archive directory at the beginning making the
whole archive unusable if an error developed there. OTOH `tar' keeps file
information along with actual data spreading it across the archive, so any
medium error only causes the immediately affected file to be lost. Same
with `cpio' (except for the arcane CLI).
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