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:
Apr. 10, 2001
Filed:
Apr. 09, 1997
Applicant:
Inventors:
Jonathan Mark Greenwood, Basingstoke, GB;
Mark John McGrath, Bracknell, GB;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
Data storage apparatus having an ordered data array of data items stored on a storage medium, in which deletion of a data item from the array leaves data storage space in which a newly stored data item can be stored, comprises means for storing a mask array on the storage medium, the mask array having a respective mask array data entry for each possible data item position in the stored data array, which is settable to indicate whether a data item is validly stored at that data array position.