METHOD FOR ALLOTTING DISK MEMORY SPACE AND MEMORY MEDIUM FOR STORING COMPRESSED DATA RECORD

PROBLEM TO BE SOLVED: To provide an improved memory space allotting device for compressed data. SOLUTION: This device allots a disk memory space for storing a compressed record, enable storing successively compressed record at a physical position on a disk 22 memory space. Such high precision is guaranteed that a record already updated for compression is stored in a physical position already allotted during processing succeeding records, and the device has interchangeability with RAID formation. A disk space allotting procedure 20 used for this method comprises a step by which a record is compressed, a step by which a compressibility (CR) value and the maximum run-length(RL) of the same data segment being continued in a non-compression record are discriminated, and a step by which a CCR value is used for allotting a memory space for a compressed record when a CCR value is less than an expected compressibility (ECR), such as a step by which correction compressibility (CCR) is discriminated by repeating compression of a record without RL of the same data segment being included in a record and continued.