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:
Dec. 20, 1994
Filed:
Jun. 15, 1993
Vinay K Aggarwal, Burlington, MA (US);
Bernardo Rub, Shrewsbury, MA (US);
William D Lewis, Northboro, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A method and apparatus for writing and reading servo data placed on a plurality of disk surfaces to minimize the degree of overlap of headers written or read by each write/read channel. Time division de-multiplexing (selecting) the writing of servo data to disk surfaces from each write/read channel and time division multiplexing the reading of servo data from the staggered headers contained on the disk surfaces coupled to each write/read channel increases the number of surfaces written to or read in a single rotation by each write/read channel. Disk surfaces are coupled to the write/read channels in groups to minimize the number of rotations required to write to or read from all the surfaces contained in the groups. Groups of surfaces may be sub-grouped. The headers of sub-groups are interleaved so that portions of the header written in a separate disk pass whose length is less than half the total length of the header may be written or read in the same rotation as another group of surfaces.