Disc cartridge sector formatting arrangement and record addressi

Details Disc cartridge sector formatting arrangement and record addressi Disc cartridge sector formatting arrangement and record addressi

1974-03-18

1976-05-11

Zache, Raulfe B.

Communications: electrical

Digital comparator systems

G06F 1300

Patent

active

039567362

ABSTRACT:
A sector formatting and record addressing scheme and associated electronic recording and detection control systems for a removable cartridge disc used in a magnetic information storage unit. Indelible sector mark and record address/format information are electronically pre-recorded on the disc at the factory using a high precision cartridge writer. This cartridge writer phase-locks the recording clock to a magnetically recorded clocking disc rotating on the same shaft as the disc via an associated position transducer to write an exact number of bytes on each track having a precise physical relationship to each other. Separate recording clocks having a wide bit-frequency spectral separation are used to write sector mark and address/format data to provide maximum sector detection reliability. The cartridge writer control system computes the optimum length of sector code for the customer-specified record size. The sector format arrangement is designed to facilitate address checking and data recovery in the user environment with a minimum of control complexity.

REFERENCES:
patent: 3337852 (1967-08-01), Lee et al.
patent: 3348213 (1967-10-01), Evans
patent: 3417378 (1968-12-01), Simonsen et al.
patent: 3493935 (1970-02-01), Questa
patent: 3525081 (1970-08-01), Flemming, Jr. et al.
patent: 3573766 (1971-04-01), Perkins
patent: 3587058 (1971-06-01), Butler et al.
patent: 3725864 (1973-04-01), Clark et al.

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