  Volume is not software enabled? (VOLINV) 
 The Question is:
 
My backups are giving me a prompt that says:
%BACKUP-E-FATALERR, fatal error on MKB400:[]DISK0.BCK  (THIS IS OBVIOUSLY MY
 BACKUP DRIVE
-SYSTEM-F-VOLINV, VOLUME IS NOT SOFTWARE ENABLED
 
I have reinititalized the backup, reviewed all logs, reviewed the script that
 has been running on our vax for the past 3 years, cleaned the backup drive,
 changed backup tapes 10 times, and I still can not get past this error to run
 a good backup.  Can you
 point me in any direction that I could review for this?
 
THanks,
 
 
 The Answer is:
 
  The initial assumption would be a hardware error, or a failure to
  unload and then reload the cassette after a tape has been dismounted
  (with /UNLOAD on the DISMOUNT or defaulted from the MOUNT) from
  certain types of tape devices -- various cartridge tapes that are
  dismounted (with the /UNLOAD option) must be removed from the drive
  and then reinserted before they can be remounted, in order to prevent
  the contents from being (unintentionally) overwritten.
 
