Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1995-06-07
1996-06-11
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360135, 360 7814, 360 48, G11B 5546
Patent
active
055262023
ABSTRACT:
An embedded servo system for a disk drive is disclosed. An asymmetrical position sub-field reduces the overhead of the disk position system. The sub-field includes at least two normal frame pairs and only one quadrature frame pair interleaved with one of the normal pairs to form the asymmetrical position sub-field. The prerecorded embedded servo information in each track of the disk includes a multiplicity of different length servo fields, i.e, each track includes at least two types of servo fields where the first type has a first length and the second type has a second length that is different from the first length. The length of a servo field refers to the number of prerecorded bytes in the servo field. The multiplicity of different length servo fields includes a first type having a full track address sub-field and a second type having a modulo track address sub-field in place of the full track address sub-field. In another embodiment, the multiplicity of different length servo fields includes the first and second types of servo fields and a third type of servo field. The third type of servo field includes only track following information and no track address information, i.e., the third type of servo field is a position only servo field. The servo fields of differing lengths are interleaved in each track of the disk. The servo fields are chosen to provide a high seek sampling rate in comparison to the required performance and a reduction in the servo overhead. Increased track following sampling is provided to make the read/write head less likely to move off track in response to external forces on the disk drive. Disk drives with different types of servo fields interleaved are particularly well-suited for small portable computers.
REFERENCES:
patent: 4511938 (1985-04-01), Betts
patent: 4987355 (1991-01-01), Leaper et al.
"Quad Burst Servo Needing No Sync ID and Having Added Information," IBM TDB vol. 33 No. 3B pp. 198-200, Aug. 1990.
Blagaila John H.
Hopper James F.
Utenick Michael R.
Integral Peripherals, Inc.
Psitos Aristotelis
Wilson James T.
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