Apparatus for efficient utilization of removable data recording

Dynamic magnetic information storage or retrieval – Head – Core

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Details

360 961, 360134, 3642383, 3642481, 3642362, 3642482, 3642363, 3642366, 3642606, 364DIG1, G06F 1574, G06F 500, G06F 1200

Patent

active

052356957

ABSTRACT:
An apparatus for efficiently utilizing data recording media performs data compression beneath the level of the host processor is disclosed. To improve the ability of a recording media to be copied without increasing host processor overhead, the control unit which sees the compressed data is checked only upon recording a predetermined amount of uncompressed data. At such time, a compression ratio is calculated for the current data set and is used to monitor the recording of the remaining data of the current data set in compressed form. When a predetermined amount of compressed data is estimated to be recorded, the predetermined amount being the minimum storage capacity of a recording media, recording begins on a new recording media. Recording media spanning is reduced by checking counters in the storage device control unit only upon completion of recording an entire data set, and then using the uncompressed size of the next data set to be recorded to determine whether or not to continue recording on the same or a new cartridge.

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IBM Technical Disclosure Bulletin, vol. 24, No. 9, Feb. 1982, p. 4483.

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