This article is from the storage FAQ part1, by Rodney D. Van Meter with numerous contributions by others.
DATATAPE (Pasadena, CA, formerly a division of Kodak), has an ID1 system available, with a HiPPI interface. You can find more info and even give them design feedback at http://www.datatape.com. The DCTR-LP400 goes up to 50 MB/sec., the fastest single general-purpose tape drive I know of. Reachable by phone at (818)796-9381 (rdv, 96/8/7)