26 Jan
2017
26 Jan
'17
10:23 a.m.
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).
Maciej