Hello Evan,
The reason is how your drive is read in the autoloader, the name differs buy make. Focusing on the issue with capacity, it totally depends on the hardware or your drive necessarily.
Try this:
1) Install Symantec Drivers post "Liveupdate" using "Tapeinst.exe" from C:\Program Files\Symatec\Backup Exec
2) Uninstall the device from device manager and reboot the server, it will pick the OEM drivers, now check in BE what the total capacity says.
Total format capacity, and total compressed capacity will differ from tape to tape and drive to drive. Backup Exec has limited or minimum control over this.
Eg: 200-400GB tapes mean 200 GB Native capacity and 400 GB compressed, not all drives shall give you 400, some may cap at 350 GB too for instance.
Confirm are you using 400 native and 800 compressed tapes? if yes, thenn the above is your issue, consider calling you hardware vendor for further support on compression.
I would love to supplement articles for you, but the above is as easy as it gets.
Let me know if you need any more info or mark this as solution if it answers your query!
Thank You!
