Description

This article is from the storage FAQ part1, by Rodney D. Van Meter with numerous contributions by others.

6.3.7 Mainframe

    Mainframe disks are sometimes referred to as SLEDs (Single Large
Expensive Disks). The term DASD (Direct Access Storage Device) usually
refers to a mainframe disk, but is occassionally applied to any hard
disk.

The WWW FAQ contains some information about mainframe CKD disks and
file systems.
    

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