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Disk Selection Techniques in a Stacked Disk Apparatus

IP.com Disclosure Number: IPCOM000088596D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Aziz, RA: AUTHOR [+4]

Abstract

Stacked flexible record storage apparatus has a tubular spindle 10 on which a plurality of flexible record disks 11 are mounted for rotation. A selection piston 12, axially movable within tubular spindle 10, operates to generate a transducer access opening 13 for accessing a surface 14 of a given flexible record storage disk. Suitable air supply means (not shown) provide a jet of air to separate disks for forming transducer access 13. Air flow also occurs within tubular spindle 10 for stabilizing rotation of record storage disk 11 in a known manner. When piston 12 is rapidly axially moved, the transducer access opening 13 tends to close and then reopen at a new axial position. Such opening and closing of the transducer access opening increases the time required to access a given surface 14 for transducing operations.

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Disk Selection Techniques in a Stacked Disk Apparatus

Stacked flexible record storage apparatus has a tubular spindle 10 on which a plurality of flexible record disks 11 are mounted for rotation. A selection piston 12, axially movable within tubular spindle 10, operates to generate a transducer access opening 13 for accessing a surface 14 of a given flexible record storage disk. Suitable air supply means (not shown) provide a jet of air to separate disks for forming transducer access 13. Air flow also occurs within tubular spindle 10 for stabilizing rotation of record storage disk 11 in a known manner. When piston 12 is rapidly axially moved, the transducer access opening 13 tends to close and then reopen at a new axial position. Such opening and closing of the transducer access opening increases the time required to access a given surface 14 for transducing operations.

However, when transducer 12 is moved axially at a relatively low speed, transducer access opening 13 is maintained. In this mode of operation termed "the slow mode", one disk at a time moves (flips) across the access opening for effectively moving the transducer access opening along the axis of the stack. That is, one disk can be flipped at a time across the access opening for enabling access to the next adjacent given surface, such as 15, for moving in the first axial direction or 16 for moving in the opposite axial direction.

Whether the fast mode or the slow mode is selected is a function of th...