disk pack

n.
A computer storage device consisting of several magnetic disks that can be used and stored as a unit.

An early removable hard disk module used in minicomputers and mainframes that contained two or more platters housed in a dust-free container. For mounting, the protective bottom of the unit was removed, and the disk pack was placed into the drive. Then the top part of the disk pack was unscrewed and removed.

Disk Packs

Disk drives used to be huge washing machine-like devices. These were the kinds of removable disk modules that were used in them.

The Actual Devices

Taken in the 1970s, this picture shows the disk pack being loaded into the drive. Such disks held only a couple of hundred megabytes. (Image courtesy of Unisys Corporation.)

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The noun has one meaning:

Meaning #1: (computer science) a portable pack of magnetic disks used in a disk storage device
  Synonym: disk pack

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