This article is from the storage FAQ part1, by Rodney D. Van Meter with numerous contributions by others.
The IBM DCMS-310800 Ultrastar2 is 10.8 GB (1GB=10^9) after format, and its sustained rate is fast -- 8.4-14.2 MB/sec (presumably pre-format, so subtract 20%). Only 5400 rpm with an 8.9 msec seek time, so middle-of-the-pack on those numbers. Fast/wide SCSI-2 interface. (rdv,95/02/14)