Browse Prior Art Database

Method to Reduce Track Misregistration on Dual Actuator Dasd

IP.com Disclosure Number: IPCOM000044398D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Nagem, RJ: AUTHOR [+2]

Abstract

Fig. 1 illustrates a ring-shaped base plate for mounting a head disk assembly 12 of a disk file and corresponds to Fig. 5 of U.S. Patent 4,263,629. Fig. 2 illustrates an improved elastomer mounting arrangement for attaching the HDA 12 to the four mounting pods 14 that are integral with the base plate 10. As shown in Fig. 2, an enlarged section of one mounting pod 14 is illustrated into which an HDA mounting bolt is attached for mounting the HDA pod casting 18 to the base plate 10. The mounting arrangement comprises a cylindrical steel insert member 20 into which two separate circular elastomer members 22 and 24 are positioned. The function of the sandwiched elastomer mounts formed by members 22 and 24 are to dampen two separate vibration modes.

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Method to Reduce Track Misregistration on Dual Actuator Dasd

Fig. 1 illustrates a ring-shaped base plate for mounting a head disk assembly 12 of a disk file and corresponds to Fig. 5 of U.S. Patent 4,263,629. Fig. 2 illustrates an improved elastomer mounting arrangement for attaching the HDA 12 to the four mounting pods 14 that are integral with the base plate 10. As shown in Fig. 2, an enlarged section of one mounting pod 14 is illustrated into which an HDA mounting bolt is attached for mounting the HDA pod casting 18 to the base plate
10. The mounting arrangement comprises a cylindrical steel insert member 20 into which two separate circular elastomer members 22 and 24 are positioned. The function of the sandwiched elastomer mounts formed by members 22 and 24 are to dampen two separate vibration modes. The source of these vibrations in a disk file includes vibrations transmitted from the spindle driving motor, the driving belt and the voice coil actuators employed for positioning the magnetic heads. These vibrations result in track-misregistration (TMR) between data heads and servo heads and affect the servo system employed to maintain the magnetic heads on the selected track. By reducing the TMR, the track densities of the disk file can be increased since the adverse effects on the servo system are minimized or eliminated and closer tolerances can be maintained in the track- following and seeking mode of the disk file.

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