Method for efficient utilization of removable data recording med

Details Method for efficient utilization of removable data recording med Method for efficient utilization of removable data recording med

1992-01-14

1994-01-11

Fleming, Michael R.

Boots, shoes, and leggings

364248, 3642481, 3642482, 3642494, 3642361, 3642362, 3642363, 3642604, 3642606, 364DIG1, G06F 1202, G06F 500

Patent

active

052789705

ABSTRACT:
A method for efficiently utilizing data recording media in a data processing system performing 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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