G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 5/54 (2006.01) G11B 5/55 (2006.01) G11B 19/04 (2006.01) G11B 21/02 (2006.01) G11B 21/22 (2006.01) G11B 33/08 (2006.01) G11B 33/12 (2006.01) G11B 33/14 (2006.01)
Patent
CA 2108703
MAGNETIC DISK DRIVE UNIT Abstract of the Invention: A high capacity, high speed memory system is presented. The system comprises a disk drive cartridge and an electronics unit. The disk drive cartridge comprises five magnetic hard disks having 300 megabytes of usable capacity housed in a hermetically sealed, self-contained unit suitable for use in extreme environments of vibration, shock and temperature. The electronics unit comprises a metal structure wherein the electronics for the system are housed. The disk drive cartridge has a temperature sensor mounted on a circuit board of the spindle assembly. The temperature sensor measures internal temperature of the disk drive cartridge. This temperature information is used to modify a seek algorithm. More specifically, to modify drive current levels to the voice coil (since voice coil resistance changes with temperature), to modify head load/unload operation, to modify temperature drift for readings of Hall effect devices, and to better account for flex bias of capton flex circuits. The disk drive cartridge also has a head loading sensor assembly. A magnetic flux sensor is disposed on a circuit board which extends over a portion of an arm assembly. The arm assembly has a permanent magnet therein position to pass under the magnetic flux sensor (e.g., a Hall effect sensor). Accordingly, as the arm assembly moves the magnetic flux from the permanent magnet detected by the flux sensor will vary. This has been determined to be a generally linear relationship. Therefore, the position of the arm assembly (more particularly, the permanent magnet in the arm assembly) is tracked by the flux sensor. Further, the arm assembly has a park or stop position wherein the arm assembly is completely moved away (fully retracted) from the disk. In this fully retracted position the heads and disk are immune to induced shock and vibration.
Richard David W.
Solari Peter L.
Raymond Engineering Inc.
Swabey Ogilvy Renault
LandOfFree
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