Patents Represented by Attorney Knearl Homer L.
  • Patent number: 4578722
    Abstract: A diskette identifying code is written in each sector on a flexible disk used in a flexible disk recorder. The diskette identifying code can be read from any track on the flexible disk and used to log the occurrence of insertion or removal of the diskette at the flexible disk recorder. Also, the diskette identifying code can be read from any accessed track prior to a write operation on that track in order to verify that the diskette has not been changed by the operator since the last access to the flexible disk.
    Type: Grant
    Filed: December 23, 1982
    Date of Patent: March 25, 1986
    Assignee: International Business Machines Corporation
    Inventors: Jeffrey L. Lovgren, William B. Plummer