Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism
Patent
1996-05-29
1998-01-20
Hindi, Nabil
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
360 55, G11B 1518
Patent
active
057106754
ABSTRACT:
A disk drive circuit that includes a configuration resistor, a reference resistor, a capacitor and a processor. The processor is mounted on a first circuit assembly in the disk drive, such as the controller circuit board, and the configuration resistor is mounted on a second circuit assembly, such as the head-disk assembly (I-IDA). The resistance of the configuration resistor corresponds to the configuration of the second circuit assembly. The configuration may represent the number of heads or the type of preamplifier in the IDA. The processor calculates the resistance of the configuration resistor to determine the configuration of the second circuit assembly in the following manner. The processor charges the capacitor. The processor then allows the capacitor to discharge through a first circuit that includes both the configuration resistor and the reference resistor and measures the discharge time or time constant. The processor again charges the capacitor. The processor then allows the capacitor to discharge through a second circuit that includes the configuration resistor but not the reference and measures the time constant. The processor calculates the resistance of the configuration resistor in response to the ratio of the time constants of the first and second circuits.
REFERENCES:
patent: 3460032 (1969-08-01), Bement et al.
patent: 4134079 (1979-01-01), Kohtani
patent: 4841458 (1989-06-01), Levine et al.
patent: 5201865 (1993-04-01), Kuehn
patent: 5357191 (1994-10-01), Grace
patent: 5416438 (1995-05-01), Shibata
patent: 5434721 (1995-07-01), Sawada et al.
Donner Kenneth D.
Goldstone Marc B.
Proud, Jr. Ralph A.
Hindi Nabil
Shara Milad G.
Western Digital Corporation
Young Leo J.
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