This article is from the storage FAQ part1, by Rodney D. Van Meter with numerous contributions by others.
Storage Tek has been working on a project called Redwood for a number of years. The cartridge will be 3480 form-factor, to protect users' investment in Storage Tek robotics. (email@example.com (Rod Van Meter)) Cartridges come in three lengths, with capacities of 10, 25 and 50 GB. That would put one of their 6,000-cartridge silos up to 300 TB. The ESCON interface is in betatest; SCSI fast & wide due out soon. (firstname.lastname@example.org, 94/12/19) Reportedly available now (95/5/15) with the SCSI interface; ESCON has been delayed until end of the year. Sustained transfer rate of 11.25 MB/s. Supports compression. List price ~$100K. Compatible with most of the STK robots. See http://www.stortek.com and also autochangers in part 2 of this FAQ.