Method and apparatus for error data feedback in a diskette drive

Details Method and apparatus for error data feedback in a diskette drive Method and apparatus for error data feedback in a diskette drive

1982-11-08

1985-06-04

Smith, Jerry

Excavating

364900, G06F 1100

Patent

active

045218846

ABSTRACT:
Error information is passed across a limited interface from a disk drive to its using system by making use of the read data line during a fault mode operation. Fault mode operation is detected by a pulse width detector in an adapter between the using system and the disk drive. The pulse width detector detects the presence of a fault signal on the read data line and inhibits the passage of the spindle motor on (MTR ON) signal from the using system to the disk drive. The step signal normally used to index the recording head is passed to the disk drive during fault mode operation. A microcomputer at the disk drive detects the absence of the MTR ON signal and the presence of the step signal and outputs a fault data bit. Thereafter, the fault data word is gated onto the read data line at the rate of one bit per step of the step signal so long as the MTR ON signal is absent.

REFERENCES:
patent: 4101969 (1978-07-01), Lawson et al.
patent: 4322813 (1982-03-01), Howard et al.
patent: 4410942 (1983-10-01), Milligan et al.
patent: 4435762 (1984-03-01), Milligan et al.
patent: 4443849 (1984-04-01), Ohwada
IBM Technical Disclosure Bulletin, vol. 23, No. 6, Nov. 1980, entitled "Electronic Interface for Magnetic Disk Machine", by D. L. Lochner.

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