Patents by Inventor Marvin Lautzenheiser

Marvin Lautzenheiser 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).

  • Method for operating a cache memory using a LRU table and access flags
    Patent number: 5615353
    Abstract: A computer data storage device made up of both solid state storage and rotating magnetic disk which maintains a fast response time approaching that of a solid state device for many workloads and improving on the response time of a normal magnetic disk for practically all workloads. The high performance is accomplished by a special hardware configuration coupled with unique procedures and algorithms pertaining to the methodology of placing and maintaining data in the most appropriate media based on actual and projected activity. The system management features a completely searchless method for determining the location of data within and between the two devices. Sufficient solid state memory capacity is incorporated to permit retention of useful, active data, as well as to permit prefetching of data into the solid state component when the probabilities favor such action.
    Type: Grant
    Filed: July 8, 1996
    Date of Patent: March 25, 1997
    Assignee: Zitel Corporation
    Inventor: Marvin Lautzenheiser
  • Method for operating a cache memory system using a recycled register for identifying a reuse status of a corresponding cache entry
    Patent number: 5594885
    Abstract: A computer data storage device made up of both solid state storage and rotating magnetic disk which maintains a fast response time approaching that of a solid state device for many workloads and improving on the response time of a normal magnetic disk for practically all workloads. The high performance is accomplished by a special hardware configuration coupled with unique procedures and algorithms pertaining to the methodology of placing and maintaining data in the most appropriate media based on actual and projected activity. The system management features a completely searchless method for determining the location of data within and between the two devices. Sufficient solid state memory capacity is incorporated to permit retention of useful, active data, as well as to permit prefetching of data into the solid state component when the probabilities favor such action.
    Type: Grant
    Filed: June 7, 1994
    Date of Patent: January 14, 1997
    Assignee: Zitel Corporation
    Inventor: Marvin Lautzenheiser
  • Cache memory utilizing address translation table
    Patent number: 5590300
    Abstract: A method for operating a cache memory system has a high speed cache memory and a mass storage device operates in a highly efficient manner with a host device. The method operates to dynamically assign segments of the cache memory to correspond to segments of the mass storage device, accept data written by the host into portions of the assigned segments of the cache memory, determines if the elapsed time since any modified data has been written to the cache memory exceeds a predetermined period of time, or if the number of modified segments exceeds a preset limit. If so, the cache memory system enables a transfer mechanism to cause modified data to be written from the cache memory to the mass storage device, based on the location of segments relative to a currently selected track of the mass storage device.
    Type: Grant
    Filed: February 22, 1995
    Date of Patent: December 31, 1996
    Assignee: Zitel Corporation
    Inventor: Marvin Lautzenheiser
  • Method of operating a cache system including determining an elapsed time or amount of data written to cache prior to writing to main storage
    Patent number: 5353430
    Abstract: A method for operating a cache memory system which has a high speed cache memory and a mass storage device that operate in a highly efficient manner with a host device. The system operates to dynamically assign segments of the cache memory to correspond to segments of the mass storage device, accept data written by the host into portions of the assigned segments of the cache memory, and determine if the elapsed time since any modified data has been written to the cache memory exceeds a predetermined period of time, or if the number of modified segments to be written to the mass storage device exceeds a preset limit. If so, the cache memory system enables a transfer mechanism to cause modified data to be written from the cache memory to the mass storage device, based on the location of segments relative to a currently selected track of the mass storage device.
    Type: Grant
    Filed: October 20, 1993
    Date of Patent: October 4, 1994
    Assignee: Zitel Corporation
    Inventor: Marvin Lautzenheiser
  • Method of operating a cache memory including determining desirability of cache ahead or cache behind based on a number of available I/O operations
    Patent number: 5325509
    Abstract: A computer data storage device made up of both solid state storage and rotating magnetic disk storage maintains a fast response time approaching that of a solid state device for many workloads and improves on the response time of a normal magnetic disk for practically all workloads. The high performance is accomplished by a special hardware configuration coupled with unique procedures and algorithms for placing and maintaining data in the most appropriate media based on actual and projected activity. The system management features a completely searchless method (no table searches) for determining the location of data within and between the two devices. Sufficient solid state memory capacity is incorporated to permit retention of useful, active data, as well as to permit prefetching of data into the solid state storage when the probabilities favor such action.
    Type: Grant
    Filed: June 21, 1993
    Date of Patent: June 28, 1994
    Assignee: Zitel Corporation
    Inventor: Marvin Lautzenheiser