Dynamic magnetic information storage or retrieval – General recording or reproducing
Patent
1983-03-22
1987-02-03
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
General recording or reproducing
360 31, 371 21, 364200, G11B 502, G06F 1100, G06F 1122, G06F 302
Patent
active
046412077
ABSTRACT:
An external diagnostic device for examining the operation of a disk drive. The device is coupled to input terminals and output terminals of the drive and operates in a selected one of several modes at a given time. In a passive mode, the drive terminals are connected to a host computer and the device monitors the presence of signals at the terminals. In a manual mode, the host computer is disconnected from the drive and the device simulates the host computer, directing control signals to the drive via appropriate input terminals. In a test mode, signals from sensors or the head in the drive are directed to the device via corresponding output terminals. Sensor and head signals are processed to determine operational parameters of the drive--such as speed, azimuth and radial alignment, sector burst, and proper reading and writing of data. Before entering the manual mode or the test mode, a step to track 00 operation is performed and a determination is made as to whether the head has been sensed at track 00. When in the passive mode, control signals from the devices are inhibited. When in the test mode, simulated control signals from the device are provided as required, the host computer and the drive being disconnected also during the test mode.
REFERENCES:
patent: 3755790 (1973-08-01), Berger
patent: 4103338 (1978-07-01), Cizmic et al.
patent: 4214280 (1980-07-01), Halfhill
patent: 4268905 (1981-05-01), Johann et al.
patent: 4333177 (1982-06-01), Sutterlin
patent: 4348761 (1982-09-01), Berger
Programmable Loop Back Read Diagnostic for Disk Drive, T. H. Miller et al, IBM Technical Disclosure, vol. 14, No. 8, 1/1972, Leibson; Handbook of Microcomputer Interfacing .COPYRGT.1983, pp. 39-45.
Cook Richard
Green George D.
Laboe Lauren M.
Bowler Alyssa H.
Cardillo Raymond F.
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