The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 1976
Filed:
Mar. 18, 1974
James O Jacques, Longmont, CO (US);
Richard D Cordano, Boulder, CO (US);
Robert F Heidecker, Longmont, CO (US);
Friedrich R Hertrich, Boulder, CO (US);
Other;
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.