Bad backup set header

[Guest]

When restoring files I recieve the following error. "Bad backup set

 

header found", and "Backup set format inconsistency" and error 109

 

(unexpected filemark or FTP end of file).

 

The book indicates that "Bad backup set header" CAN indicate a SCSI

 

problem. I have changed the SCSI cable, moved the drive to a different

 

computer and also isolated that device on the SCSI chain only to recieve the

 

same error.

 

Is this not a SCSI problem or is the tape not usable. Any info would be

 

great.