This article is from the storage FAQ part1, by Rodney D. Van Meter with numerous contributions by others.
From Martin Marrieta, mentioned here on the net recently. Very fast (10.8 MB/sec.), ~$125K. General availability scheduled for 11/14/94 (9/20/94, firstname.lastname@example.org). I believe the cartridge is the same as Betacam, so look for the broadcast autochanger companies here (rdv).