Tracy D. Dyer
Engineering at Baltic Pl, Denver, CO
License number
Louisiana EI.0006850
Issued Date
Jan 1, 1900
Category
Civil Engineer
Address
Address
14730 E Baltic Pl, Denver, CO 80014
Professional information
Adaptive Data Compression Apparatus Including Run Length Encoding For A Tape Drive System
US Patent:
4929946, May 29, 1990
Filed:
Feb 9, 1989
Appl. No.:
7/308767
Inventors:
John T. O'Brien - Lafayette CO
Neil L. Thomas - Boulder CO
Tracy D. Dyer - Aurora CO
Neil L. Thomas - Boulder CO
Tracy D. Dyer - Aurora CO
Assignee:
Storage Technology Corporation - Louisville CO
International Classification:
H03M 748
US Classification:
341 87
Abstract:
The adaptive data compression apparatus is located within a tape drive control unit which is interposed between one or more host computers and one or more tape transports. The adaptive data compression apparatus functions to efficiently compress a user data file received from a host computer into a bit oriented compressed format for storage on the magnetic tape that is loaded in the tape transport. The data compression apparatus divides each block of an incoming user data file into predetermined sized segments, each of which is compressed independently without reference to any other segment in the user data file. The data compression apparatus concurrently uses a plurality of data compression algorithms to adapt the data compression operation to the particular data stored in the user data file. A cyclic redundancy check circuit is used to compute a predetermined length CRC code from all of the incoming user data bytes before they are compressed. The computed CRC code is appended to the end of the compressed data block.