Browse Prior Art Database

Multiple-Disk Floppy System and Disk Selection Mechanism

IP.com Disclosure Number: IPCOM000041995D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Nassimbene, EG: AUTHOR

Abstract

In the floppy disk industry, there is a continual push for greater capacity; this is primarily being addressed by increasing the track density and increasing the linear bit density. This article addresses the problem by increasing the surfaces used. It is proposed here to stack several disks (2 or 4) together inside a single jacket. Then by a selection mechanism to be described, to insert a narrow head between the disks and read the data. There are many ways possible to search for and select the appropriate disk out of a stack of, say, 4 disks, but because of the requirement for extremely low costs in the floppy disk industry, the following is considered the cheapest possible. The disks in the stack are each slightly smaller in diameter than the next (Fig. 1). The front edge of the head is stepped into the disk wanted.

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Multiple-Disk Floppy System and Disk Selection Mechanism

In the floppy disk industry, there is a continual push for greater capacity; this is primarily being addressed by increasing the track density and increasing the linear bit density. This article addresses the problem by increasing the surfaces used. It is proposed here to stack several disks (2 or 4) together inside a single jacket. Then by a selection mechanism to be described, to insert a narrow head between the disks and read the data. There are many ways possible to search for and select the appropriate disk out of a stack of, say, 4 disks, but because of the requirement for extremely low costs in the floppy disk industry, the following is considered the cheapest possible. The disks in the stack are each slightly smaller in diameter than the next (Fig. 1). The front edge of the head is stepped into the disk wanted. A small plunger on the back side of the disk stack is activated (Fig. 2). This causes the stack to flex forward against the head. Those disks hitting the head are held back, and the rest move forward. This opens up the disk package far enough for the head to be moved forward and in between the disks. The cost is minimal because the head-stepping mechanism already exists in the floppy drives; the only thing required to add to make this selection mechanism work is a simple plunger solenoid. For a single-sided multi-stacked floppy disk system, the design is such that the felt pressure pad is alw...