Specifications

The third batch of files is successfully appended to the tape.
Although this restriction has always existed for certain SCSI tape
drives, the default SCSI tape driver for UNIX (without the UNIX
SCSI Manager installed) does not report the error when you
attempt to go directly between READ and WRITE states. The error
still occurs, but it is not reported. To execute the task described in
the previous example without viewing the first two batches of
files, use this example:
tape -s rewind /dev/nrStp0
tar cbf 20 /dev/nrStp0 first batch of files
tar cbf 20 /dev/nrStp0 second batch of files
tape -s rewind/dev/nrStp0
You can append additional files to the tape as shown:
tape -s rfm /dev/nrStp0
tape -s rfm /dev/nrStp0
tape -s rfm /dev/nrStp0 (creates a read error,
but no error message)
tar cbf 20 /dev/nrStp0 third batch of files
Warning Messages During Heavy Disk Access
When you are frequently accessing multiple partitions on one or
more hard disks, you may see warning messages such as
Region
table overflow and File Table overflow. If you encounter
these or similar messages, you must modify certain kernel
parameters. See your UNIX documentation for additional
information.
Errors on SCSI Hard Disk Drives
The hard disk driver may report the following error message,
which can be safely ignored:
WARNING:Sdsk unit 2: unrecoverable error:
key 0 0 0. data block 0
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Installing Software Drivers for UNIX