Patents by Inventor Larry D. Shumway

Larry D. Shumway has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • System and method for worm volume management of new and updated data files using variable threshold block addresses
    Patent number: 5491807
    Abstract: A computer system and method for efficiently managing Write Once Read Mostly (WORM) volumes on mass optical storage devices are disclosed. A configuration menu asks the user to enter a threshold percentage from 1-100%. The threshold percentage is multiplied by the volume size to determine a threshold block address. New files are written sequentially to the WORM volume up to but not exceeding the threshold block address, unless a threshold override indicator is enabled. Space on the WORM volume between the threshold block address and the end of the WORM volume is reserved for updated files. Updated files can be stored anywhere on the WORM volume, including above the threshold block address. Reserving space for updated files on a WORM volume allows more updated files to be stored on the same WORM volume as original files, and reduces the number of optical disks required to be read.
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: February 13, 1996
    Assignee: International Business Machines Corporation
    Inventors: Harrison L. Freeman, William Jaaskelainen, Richard G. Mustain, Larry D. Shumway