You could try DriveSpeed, its contained in the following files on the Elbox site, its fairly accurate but cli/shell only...
FastATA4000v25a33 (A4000 Version)
FastATA_MKIIIv88a35 (1200 Version)
Not sure if, but I think they both written in standard 68k (both work fine on an A1200)
http://www.elbox.com/downloads_fastata.html
