Address mark generating method and its circuit in a data memory

Details Address mark generating method and its circuit in a data memory Address mark generating method and its circuit in a data memory

1989-03-23

1991-10-29

Envall, Jr., Roy N.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 48, 360 49, 341 59, G11B 509, G11B 2014, G11B 2016

Patent

active

050620118

ABSTRACT:
When data are memorized in a 2-7 RLL code on a disc shaped memorizing medium using a sector format, as an address mark in each sector a 2-7 illegal pattern is used; a 1-byte data "8B" in an NRZ signal is converted into a 2-7 RLL code, and further it is modified into the 2-7 illegal pattern.
A disc controller in a disc memory inserts the 1-byte data "8B" into a specified position in an NRZ signal and transmits it to an encoder/decoder. In the encoder, the 1-byte data "8B" in an NRZ signal is detected, and a 2-7 illegal pattern is formed by reversing a specified bit of a 2-7 RLL code formed by converting the 1-byte data "8B", and the illegal pattern is sent to the read/write amplifier.

REFERENCES:
patent: 3471830 (1969-10-01), McRae et al.
patent: 3689899 (1972-09-01), Franaszek
patent: 4697167 (1987-09-01), O'Keeffe et al.
patent: 4752841 (1988-06-01), Syracuse et al.
patent: 4757406 (1988-07-01), Stewart et al.
patent: 4819153 (1989-04-01), Graham et al.
Adaptec, Inc. "2,7 RLL Encoder, Decoder", (AIC-270) 1982, 1987.

Affiliated with

Also associated with

Rating

Address mark generating method and its circuit in a data memory does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Address mark generating method and its circuit in a data memory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Address mark generating method and its circuit in a data memory will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1403384