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Multiple Access Flexible Disk Storage Apparatus

IP.com Disclosure Number: IPCOM000084955D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 59K

Publishing Venue

IBM

Related People

Koestner, JH: AUTHOR [+2]

Abstract

Mass storage systems not only have cost constraints but also high-reliability requirements. When a mass storage is constructed of a stack of flexible disk files and accessed by a beveled disk-separating blade from the exterior of the stack of disks, certain geometric configurations provide both low cost and high recoverability from mass storage failures.

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Multiple Access Flexible Disk Storage Apparatus

Mass storage systems not only have cost constraints but also high-reliability requirements. When a mass storage is constructed of a stack of flexible disk files and accessed by a beveled disk-separating blade from the exterior of the stack of disks, certain geometric configurations provide both low cost and high recoverability from mass storage failures.

The mass storage apparatus consists of four separate axiallv separated stacks of flexible disks commonly rotated on a common support shaft. The four stacks A, B, C, and D each have their own stabilizing plate at one or both axial ends. In this manner, the stacks are mechanically independent insofar as accessing is concerned yielding a four-module mass storage apparatus. In a preferred mode of operation, each of the stacked modules are accessing independently by mechanically isolated disk separator blades A, B, C, and D, respectively. Each blade is axially movable on a separate lead screw and positioned by servo-positioning mechanisms, not shown.

In the normal mode of operation, blade A accesses stack A, blade B accesses stack B, etc. Each blade has a transducer T mounted thereon for allowing more than one blade to access a given stack module. Blade paths are mutually exclusive. The maximum radial penetration of each blade is represented by a primed alpha character corresponding to the blade; hence, blade A can go to limit line A', B to B', C to C', and D to D'. The outer extremity of the blades follows the lines labeled AB, BC, CD, and DA, respectively, for blades A-D.

Inspection of the figure shows no blade will interact with another blade,...