I goofed and was looking under ATL rather than Quantum. My bad on that.
It's been a while since I was asked about this device. Now that my memory serves me better, I recall seeing this before.
Look at bullet point #1 for the ATL 1500 (I stuck with 11d for this one):
Any tape drive supported with the M4^DATA^MagFile inquiry string is also supported with the ATL^^^^^M1500 or ATL^^^^^1500 inquiry string, and vice versa. The ATL^^^^^1500 inquiry string support can be found in DDI 11d (11.0) 20080215 7170 . Use latest DDI available <http://entsupport.symantec.com/umi/V-269-10 >.
Install the latest device driver for 11d and you should be golden. We do not work out of the box with that device, but will after you install the most up to date driver:
http://support.veritas.com/docs/300325