This became a standard size for mainframe and minicomputer drives for many years.
From the en.wikipedia.org
The minicomputer market was just being pioneered by the Digital Equipment Corp.
From the post-gazette.com
Sales are declining, and they will be as obsolete as a DEC minicomputer in 3 years.
From the forbes.com
The Digital Equipment Corporation introduced the PDP-8 minicomputer in 1965.
From the telegraph.co.uk
Trott said the robot runs on software from a minicomputer that is attached.
From the sacbee.com
Many of the first generation of PC programmers were educated on minicomputer systems.
From the en.wikipedia.org
During this period NCR also produced the 605 minicomputer for in-house use.
From the en.wikipedia.org
If you think this is nuts, just ponder the line from the minicomputer to your smartphone.
From the businessweek.com
I myself was lost in minicomputer land and didn't find the PC market for another decade.
From the forbes.com
More examples
A digital computer of medium size
The term evolved in the 1960s to describe the "small" third generation computers that became possible with the use of integrated circuit and core memory technologies. ...
A computer smaller than a mainframe, but larger than a microcomputer
Term for computers intermediate in processing power between microcomputers and mainframe computers.
A multi-user computer capable of supporting from 10 to hundreds of users simultaneously.
A type of midrange computer.
A stand-alone computer system that generally supports anywhere from five to a few hundred users simultaneously. Traditional minicomputers have often been replaced by client/server networks and peer-to-peer networks. See also Computer.
A medium sized computer, usually fitting within a single cabinet, serving the needs of multiple users within a small organizational unit. Has more memory and a higher execution speed than a microcomputer. Also referred to as a workstation or midrange.
A nearly obsolete term used to describe an older computer usually around the size of a refrigerator. This computer was used by businesses for processing transactions, accessing databases and running reports. These minicomputers typically accommodated between 10 - 300 users simultaneously.