Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1997-02-12
2000-09-12
Klimowicz, William
Dynamic magnetic information storage or retrieval
Record medium
Disk
G11B 582
Patent
active
061186325
ABSTRACT:
A magnetic disk with nonmagnetic information encoded under, in or above the magnetic layer of the disk is described along with the disk drive using the magnetic disks. The information may be stored as a series of laser-written marks (e.g., bumps, oxidized spots or spots with altered reflectivity) upon the surface(s) of each disk of the disk stack. The set of marks may be a series of laser bumps which serve a dual purpose as a landing zone or contact start/stop (CSS) zone for the slider and as encoded identifying information. During the manufacturing process for disk drives containing the disks, each disk's identifier can be read using outboard equipment such as an HRF tester or by means contained in the drive itself. Each disk identifier can then be stored magnetically in a special region of the hard disk reserved for use by the drive and/or within the flash memory of the hard drive. The drive can then communicate the identifier(s) to a host computer using the conventional communication hardware and firmware. In this way selected information such as the origin, batch number, date of manufacture, serial number, etc. of any disk can be obtained when needed as, for example, as part of failure analysis.
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Albrecht Thomas Robert
Baumgart Peter Michael
Nguyen Thao Anh
Rubin Kurt Allen
Tam Andrew Ching
International Business Machines - Corporation
Klimowicz William
Knight G. Marlin
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