公开(公告)号：DE2965658D1

公开(公告)日：1983-07-21

申请号：DE2965658

申请日：1979-07-31

Applicant: IBM

Inventor： LAVGREN JEFFREY LYNN ,  QUINLAN WILLIAM PATRICK

IPC: G11B5/54 ,  G11B21/12

公开(公告)号：DE3370212D1

公开(公告)日：1987-04-16

申请号：DE3370212

申请日：1983-09-20

Applicant: IBM

Inventor： DIX GARY LEE ,  HEIM LLOYD STEPHEN ,  HERALD ROBERT FREDERICK ,  QUINLAN WILLIAM PATRICK

IPC: G11B20/10 ,  G06F11/07 ,  G11B19/04 ,  G11B20/18 ,  G06F11/00 ,  G11B5/09

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.

公开(公告)号：DE2964535D1

公开(公告)日：1983-02-24

申请号：DE2964535

申请日：1979-07-31

Applicant: IBM

Inventor： LOVGREN JEFFREY LYNN ,  QUINLAN WILLIAM PATRICK

IPC: G11B21/20 ,  G11B5/54 ,  G11B21/12 ,  G11B21/16 ,  G11B21/21

Abstract: Information transfer apparatus in which a transducer 150F is movable by a solenod 130F from an inoperative position separated from a moving information carrying magnetic disk 20F towards the disk into engagement therewith in response to a transducer load command signal on line 208 which is applied to a control system connected to the solenoid to energise it. The control system is such as to produce an initial fast rising current in the solenoid to move the head quickly into close proximity with the disk, a slowly rising subsequent current in the solenoid to engage the head with the disk gradually, and a final fast rising current in the solenoid for completing the engagement pressure of the head on the disk.