Magnetic data storage apparatus having a magnetic disk normally

Details Magnetic data storage apparatus having a magnetic disk normally Magnetic data storage apparatus having a magnetic disk normally

1985-01-11

1986-06-03

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78, G11B 555

Patent

active

045933294

ABSTRACT:
A magnetic data storage apparatus such as a Winchester disk drive is disclosed wherein a transducer head or heads are normally held in contact with a magnetic disk or disks and move out of contact therewith for data transfer when the disk or disks are set into rotation. In order to preclude the possibility of the transducer head destroying the series of concentric data storage tracks on the magnetic disk, the head is normally retained on a head landing track formed on the disk, preferably radially inwardly of the data storage tracks. When the disk is set into rotation, the head is transported to a position over a desired one of the data storage tracks for the commencement of data transfer only after it has moved out of contact with the head landing track. Upon completion of each run of data transfer, the head is returned to a position over the head landing track for landing thereon when the disk is set out of rotation. The head return to the head landing track is effected by computing the difference between the addresses of the head landing track and of that one of the data storage tracks which the head accessed for the last time, and by delivering the corresponding number of pulses to a stepping motor included in the head transport mechanism.

REFERENCES:
patent: 4007492 (1977-02-01), Rose
patent: 4139874 (1979-02-01), Shiraishi
patent: 4194226 (1980-03-01), Kaseta et al.
patent: 4396959 (1983-08-01), Harrison et al.

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