Tapes being marked as read only. (4045533)

Date - 09/2007
Affected Product & Version - NetVault: Backup 7.4.5 and 8.x
Affected Module & Version -
OS Version - Any
Application Information -


Description:
Possible solution for Tapes being randomly marked as Read Only.

Symptoms:
Tapes are marked as Read Only but there is no observable pattern which explains why.

In the binary log we see "Media Error" error messages on the tape drive.
These messages are marked as having context with an exclamation mark in the red warning circle. Opening this item by double clicking and scrolling down to the end of the text shows further error messages like:

SCSI :3300 25 0 134321 CMD WRITE [ 0a 01 00 00 01 00 ]
SCSI :3300 17 0 134321 CMD SENSE KEY 'ABORTED COMMAND ' [b] - ASC 47 ASCQ 03
SCSI :3300 18 0 134321 CMD SENSE INFO '<UNKNOWN>'
TAPESCSI:3300 85 0 134321 Unexpected error writing to media
MEDWRITE:3300 183 1 134321 Device write data out: FAILED