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An early type of hard disk.
[After the Winchester, , tradename for a .30-30 rifle, a rifle shooting a .30-caliber bullet with a powder grain size designation of 30 (from the disk's storage capacity of 30 MB and its access time of 30 milliseconds).]
(Computer Science) a type of hard disk in which disks are permanently sealed, together with read-write heads, in an airtight container to keep dust out
[C20: named after the 3030 Winchester rifle, as the original device would have had 3030 as its IBM number]
a hard disk permanently mounted in a hermetically sealed unit that is housed either within a computer's CPU or in an external disk drive case.
[1970–75; from the designation for the prototype, 3030 (two disks of 30 megabytes each), the same as a well-known Winchester rifle. See .30-30]