Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1990-07-13
1994-07-26
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7702, 360 7708, G11B 5596
Patent
active
053330846
ABSTRACT:
A disk drive in which the radial alignment, track zero alignment, index to data timing, write current, asymmetry and threshold dropout can be electronically adjusted. A plurality of programs stored in random access memory run a plurality of adjustment procedures used to control the electronic adjustment functions of the disk drive. An alignment disk read by the disk drive provides alignment data for the radial, track zero and index to data alignment procedures. A microstepper circuit in the disk drive allows the read/write heads to be moved in discrete steps of approximately 1/126 of the track pitch for electronically adjusting the radial and track zero parameters. The index to data alignment is set by generating and storing an artifical index offset value. The write current and asymmetry adjustment procedures utilize digital to analog convertors (DACS) to vary the voltage supplied to the read/write heads. The threshold dropout procedure utilizes a DAC to control the output of a pulse detector.
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"Tronix DMA Manual"--1989 Ironia Peripherals Inc., Santa Clara, Calif.
"Dyson 350A & 350/2A Alignment Instruction booklet"--1985 pp. 1-15 Xidex Corp.
B. Naegel "Brikon (Brian) Floppy disk tester document" F.I.B. #31, pp. 2-5 (Sep. 27, 1985).
Davis Titus E.
Galloway Gregory M.
Williams Roger O.
Galloway Gregory M.
Hughes Michael J.
Psitos Aristotelis
Sheladia Varsha V.
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