Winchester disk

American  

noun

Computers.

1. a hard disk that is permanently mounted in its unit.

---

Winchester disk British  

noun

1. a type of hard disk in which disks are permanently sealed, together with read-write heads, in an airtight container to keep dust out

---

Etymology

Origin of Winchester disk

First recorded in 1970–75; originally an IBM code name; the designation for a device containing two such disks was 3030 (each disk containing 30 megabytes), the same as the model number of a well-known Winchester rifle