Looking to read past EOT on DDS/DLT/LTO
Maciej W. Rozycki
macro at linux-mips.org
Wed Jan 25 18:07:14 CST 2017
On Wed, 25 Jan 2017, Eric Smith wrote:
> > The problem:
> > They then accidentally overwrote the start of the tape yesterday
> > with about 1 KB of data, plus EOT.
> I hope someone can prove me wrong, but I think that short of a major effort
> to hack the drive firmware, the data is gone. Modern tape drives are "too
> smart" to allow reading past logical EOT, and the tape format is too
> complex to allow fooling the firmware by any simple means.
ISTR being able to successfully do `mt fsr' after `mt eod' with a DDS-4
drive and `mt tell' returned sensible status afterwards, so chances are it
might work. It might depend however on the particular drive, OS and
version of `mt' as there seem to be several implementations around; maybe
also whether firmware-driven data compression has been used. Plus my
memory may be fooling me as it's been years since. I think it's surely
worth trying though, as there's nothing to lose.
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