C3013A Kittyhawk Disk Drive
20MB dual 1.3" platter hard drive
Early 1990s
Made in Japan

the photos show two units, one has been opened to reveal the platters (top one damaged) and the read/write heads.
Hewlett Packard,

Donated/on loan from: School of Computing, Electronics and Mathematics, Plymouth University

Relevant URLs

Information on the Kittyhawk drives

Drive top/bottom view