System and method for servowriting a magnetic disk drive

Details System and method for servowriting a magnetic disk drive System and method for servowriting a magnetic disk drive

1992-12-11

1994-08-16

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 7703, 360 9703, 369 13, G11B 509

Patent

active

053392043

ABSTRACT:
A magnetic disk drive is provided with a system and method for writing a servo pattern after the head disk assembly (HDA) is sealed. A clock track is written inside the sealed HDA using a Monte Carlo technique. The clock track is read by a magneto-optical head through a window in the HDA housing, and the time transitions therefrom are used to control the product heads. The entire servo pattern for the disk drive is thus written with the HDA unit completely sealed.

REFERENCES:
patent: 4068268 (1978-01-01), Idemoto et al.
patent: 4131920 (1978-12-01), Berger
patent: 4531167 (1985-07-01), Berger
patent: 4783705 (1988-11-01), Moon et al.
patent: 4980783 (1990-12-01), Moir et al.
patent: 5243479 (1993-09-01), Nakagoshi et al.
IBM Technical Disclosure Bulletin vol. 27 No. 88, pp. 4877-4878, "Servowriter Reference Clocks From Shaft Encoder" Jan. '85.
IBM TDB vol. 33 No. 5, pp. 310-311, Oct. '90, "Regenerative Clock Technical for Servo Track Writers".
IBM TDB vol. 33 No. 11 p. 428; Apr. '91, "Head Positioning to Servowrite Magnetic Disk Files".
Mee and Daniel, "Magnetic Recording vol. 2, Computer Data Storage" 1988 McGraw-Hill Chapter 6.

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