3 May
2002
3 May
'02
2:15 p.m.
Re:
With modern SCSI tape devices, blocking and
unblocking are no
longer a necessity, as the hardware reads and writes 512-byte data blocks.
With DDS, however, variable length records are possible ... however unlikely
they might be in normal Unix usage.
I just successfully did:
insert new tape
write 10 bytes
write 12 bytes
write 14 bytes
rewind
read 20000 bytes --> got 10 bytes
read 20000 bytes --> got 12 bytes
read 20000 bytes --> got 14 bytes
So, the DDS (DAT) drive (which happens to be SCSI) is remembering the
record lengths, supporting variable length records.
Stan Sieler sieler(a)allegro.com
www.allegro.com/sieler/wanted/index.html www.allegro.com/sieler