Gene Heskett wrote: > Be aware that for many tape formats, the compression status is saved > in a hidden header of the tape, so that once its been written in the > compression on mode, that will be restored to on when the > tape is loaded regardless of your wishes unless specifically disabled. > > I had a script at one time that turned these flags off, and it looked > something like this: > > #!/bin/sh > mt -f /dev/nst0 rewind > dd if=/dev/st0 of=./scratch count=1 > mt -f /dev/nst0 defcompression off (or 0 depending on your mt) > mt -f /dev/nst0 compression off (or 0 depending on your mt) > dd if=./scratch of =/dev/nst0 > dd if=/dev/zero of=/dev/st0 count=(your drives buffer size plus 1) > dd if=/dev/st0 (should show the tape label unchanged from ./scratch) > > Note use of /dev/st0 for its automatic rewind in places. simplifies > the script..
Gene, thanks a lot, I think this should go into the FAQ soon. Could you (or somebody else) write some additional intro about why and when this procedure is necessary? This would help a lot, thanks. Greets, Stefan
