This article is from the storage FAQ part2, by Rodney D. Van Meter with numerous contributions by others.
Computer Technology Review magazine, 310/208-1335, free to some. Electronic News, weekly, 800/722-2346. MacWeek, June 7, 1993, Page 36+ IEEE Computer had a full issue in March 94 on I/O subsystems There are also two books by Sanjay Ranade (firstname.lastname@example.org), who posts here occassionally. One is Mass Storage Technologies (1991ish?), the other, newer one is Mass Storage Systems. I've read the first one, it's a little short on detail but a good overview.