I have a HP 8x Autoloader connected to the server, I am running Symantec Backup Exec 12. For some reason about a week ago my backups starting to fail. Backup Exec sees the device and I am able to inventory; scan and format tapes. Once I do a format and restart the backup the backups begin to fail and the tape are labled "Not appendable (End marker unreadable)". I have switched tapes, tape drive, scsi terminator. Not sure what else to do. I ran HP StorageWorks tape tools and everything test good, the tapes are listed correctly, firmware is up to date.