>where doing Daily backups to DDS3 tapes with a block size of 4096, which >seem to work sometimes. more often than if I use a block size of 0.
I'm amazed that works unless you re-amlabel the tapes whenever you change the blocksize. Going either direction without doing so should cause errors. >and where doing Monthly backups to DDS4 tapes with a block size of 4096, >and they completely fail with the error messages below. Are you certain those tapes were created with 4K? Set the block size back to zero (for the moment) and do this: mt rewind dd if=$TAPE bs=32k of=/tmp/first-record count=1 mt rewind dd if=$TAPE bs=32k of=/tmp/first-file See how big /tmp/first-record is. That's the block size the tape was written at. If it's 4K, the second dd should tell you it read 0+8 records (no full 32K blocks, 8 partials), and /tmp/first-file should be 32K. John R. Jackson, Technical Software Specialist, [EMAIL PROTECTED]
