Described here:
http://www.picklesnet.com/burroughs/descriptions/bltc.htm
as having a small fixed-head-per-track disk drive.
The TC-500 featured in the epic story of Barclays' UK bank automation
project as described here, see from page 12 onwards:
http://oro.open.ac.uk/23510/1/Martin,Ian%5B2010%5DToo.Far.Ahead.of.its.Time…