Title:
TROUBLE DATA TRANSFER UNIT
Document Type and Number:
Japanese Patent JPS5987658
Kind Code:
A
Abstract:
Error information is passed across a limited interface (10) 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 (46) 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 (STEP) normally used to index the recording head is passed to the disk drive during fault mode operation. A microcomputer (30) 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 so long as the MTR ON signal is absent.
Inventors:
GEIRII RII DEITSUKUSU
ROIDO SUTEFUAN HAIMU
ROBAATO FUREDERITSUKU HERARUDO
UIRIAMU PATORITSUKU KUINRAN
ROIDO SUTEFUAN HAIMU
ROBAATO FUREDERITSUKU HERARUDO
UIRIAMU PATORITSUKU KUINRAN
Application Number:
JP18858683A
Publication Date:
May 21, 1984
Filing Date:
October 11, 1983
Export Citation:
Assignee:
IBM
International Classes:
G11B20/10; G06F11/07; G11B19/04; G11B20/18; (IPC1-7): G11B5/09; G11B19/04
Attorney, Agent or Firm:
Jiro Yamamoto
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