Thanks for the info, Ken. It may well me that you hit the nail on the head, but I'm really not very familiar with tape drives--I've never had much cause to worry with them until now!
Does anyone know if the Seagate STT28000A (Hornet Travan 4) drive is capable of hardware compression? If so, at least I would be able to give my customer a definite answer. I know for a fact that the software compression was NOT turned on during the backups, so that shouldn't be an issue.
Thanks again, Ken, and anyone else who may have helpful info.
Roger