Now, it occurred to me that you may have thought
"ohhh, DLT drive, 10 to 20
 GB per tape." and if that was the case I hate to disappoint you. You'd
 would need to find a TZ89 rather than a TZ85. 
The 20GB uncompressed drive is the TZ88/DLT4000.
--
Eric Dittman
dittman(a)dittman.net
Check out the DEC Enthusiasts Club at 
http://www.dittman.net/