This old Fujitsu Hard Disk drive, shown here, dates from  the 1980's. It uses 6 x 8 inch disks and has a storage capacity of under 300Mbs  Three different voltage supplies (5V, -12V, and 24V) are required and the drive consumes around 150W. As seen here, it is housed in a removable caddy. The complete assembly is heavy and only just portable.  The drive is approximately 40cm (16") long.

Want to dismantle it and see what is inside? Just 'Click' on picture or the spanner icon below.