Browse Prior Art Database

Self Pressurized Enclosure for Flexible Magnetic Disks

IP.com Disclosure Number: IPCOM000087424D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Boyles, KA: AUTHOR

Abstract

In the magnetic recording of data, good performance of a flexible-disk file requires axial stability of the disk medium and a constant force on the read/write head at all radii on the disk.

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Self Pressurized Enclosure for Flexible Magnetic Disks

In the magnetic recording of data, good performance of a flexible-disk file requires axial stability of the disk medium and a constant force on the read/write head at all radii on the disk.

Enclosure or cartridge 10 (Fig. 1) improves upon the conventional free-air Bernoulli plate by applying pressure forces on both sides of disk medium 11. An air-intake part 12 in lower surface 13 surrounds drive spindle 14. Air flows radially outward to one or more exhaust ports 15 on upper surface 16 of enclosure 10. A read/write head (not shown) engages disk 11 through elongated access slot 17.

The position of disk 11, within the thin enclosure cavity 18, is controlled by the size of ports 12 and 15. Fig. 2 shows the variation of head force F with disk radius R for several different sizes of intake port 12; the size decreases in the direction of the arrow labeled IN. Fig. 3 shows this variation for several sizes of exhaust port 15; the size decreases in the direction labeled EX.

For further improvement in stability and position control of disk 11, upper surface 16 may be provided with several radial ribs 19. By modifying the radial pressure distribution above disk 11, the shape and size of ribs 19 provide a fine- tuning capability for controlling media position. For the straight profile of the ribs shown at 19' in Fig. 1, the head force decreases slightly, then increases slightly, with increasing disk radius. For a tapered...