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Interchangeable Low Density Floppy Disks

IP.com Disclosure Number: IPCOM000044823D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Quist, FF: AUTHOR [+2]

Abstract

A removable drive hub enables a low track density floppy disk to be read by either a colleting type low track density disk drive, or by a high track density disk drive which requires that the floppy disk have an integral drive hub.

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Interchangeable Low Density Floppy Disks

A removable drive hub enables a low track density floppy disk to be read by either a colleting type low track density disk drive, or by a high track density disk drive which requires that the floppy disk have an integral drive hub.

State of the art low track density floppy disk drives (i.e., 48 tracks per inch) include a collet which enters and clamps to the center opening provided in floppy disks. An example is the 5»-inch floppy disk. High track density disk drive systems (i.e., l35 or more tracks per inch) find it necessary to provide more accurate locating of the floppy disk, and accordingly provide a rigid drive hub to be permanently mounted at the center of the floppy disk. The high track density disk drive then includes a mating drive surface or clamp. These high track density disk drives are, however, capable of reading either a high track density disk or a low track density disk.

In order to provide compatibility for a disk written at low track density, a removable drive hub is provided which temporarily snaps into the disk's center opening. This hub is an analog to the aforesaid permanent drive hub which is permanently carried by all high track density disks. The low track density disk can now be read and written by a high track density drive, whereupon the snap-in drive hub is removed, and the disk is again usable in low track density drives.

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