Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1994-04-18
1996-01-09
Young, W. R.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7702, G11B 5596
Patent
active
054833930
ABSTRACT:
A disk drive for use with an embedded head positioning servo system is disclosed. The disk drive includes a disk on the surface of which spaced-apart servo bursts are prerecorded in servo sectors. Successive servo bursts are read by a read/write head which produces oscillating signals having variable magnitude peaks. A timing circuit provides a timing signal, synchronized with the occurrence of the servo sectors, which defines, in time, a servo signal window, during which time a servo burst is being read by the read/write head. A detector circuit measures the magnitudes of each of the peak signals of a servo burst occurring in the servo timing window. The median peak value for a burst is stored, a next burst is detected and measured and the median peak value for that burst is stored. By comparing the median peak magnitudes of successive servo bursts, a servo error signal for use in correcting any error in head position relative to a desired track centerline is produced. The servo error signal is applied to an electrically controlled actuator which moves the read/write head.
REFERENCES:
patent: 4424543 (1984-01-01), Lewis et al.
patent: 4910617 (1990-03-01), Brunnett et al.
patent: 5177651 (1993-01-01), Moraru et al.
Mento Robert P.
Reh Jeffrey G.
Habermehl James L.
Ward James A.
Western Digital Corporation
Young Leo J.
Young W. R.
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