# US 4,400,753 A · Universal magnetic recording disk cartridge

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- Number: US 4,400,753 A
- Document ID: US4400753A
- Status: Granted
- Kind: A
- Application number: 06/275,543
- Filed: 1981-06-19
- Granted: 1983-08-23
- Earliest claimed: 1981-06-19
- Assignees: International Business Machines Corporation
- Inventors: William E. Beebe; Dean R. Duff
- Web page: https://patentgrep.com/patent/US4400753A

## CPC

- G11B 23/032: {for rigid discs}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

An information storage cartridge utilized in a disk drive including a rotary magnetic recording disk and cover for containing the disk. The cover includes a plurality of orientation apertures and transducer apertures which are associated such that orientation sensing means in the disk drive can determine the orientation of the cartridge when it is inserted in the disk drive and thereby whether the information recorded on the disk is recorded on both sides of the disk or only on one side.

## Claims

### Claim 1

In an information storage cartridge utilized in a disk drive including a rotary magnetic recording disk and cover containing said disk, the improvement comprising in combination:
a single orientation aperture in said disk located at a distance from the center of said disk;
a plurality of orientation apertures in said cover defined in a plane lying in substantially coplanar relation to said disk and located an equal distance from the center of said disk for defining the orientation of said disk in said disk drive for reading and recording information on said disk at a first or second recording density; and
a plurality of pairs of transducer apertures in said cover for exposing the recording surface of said disk for reading and recording thereon, each pair of said transducer apertures associated with one or more of said orientation apertures for determining that the recording of information on said disk is on one side or both sides of said disk when said cartridge is inserted in said disk drive.

### Claim 2 (depends on 1)

The improved information storage cartridge of claim 1 wherein each pair of transducer apertures is associated with a single orientation aperture for reading and recording information on both sides of said disk in a single orentation position on a disk drive having dual transducers.

### Claim 3 (depends on 1, 2)

The improved information storage cartridge of claim 1 or claim 2 wherein said pairs of transducer apertures are spaced 90.degree. apart in said cover and wherein said orientation apertures indicate a change in recording density when said cartridge is rotated 90.degree. in said disk drive.