Dynamic magnetic information storage or retrieval – Head – Core
Patent
1989-03-20
1996-02-13
Gossage, Glenn
Dynamic magnetic information storage or retrieval
Head
Core
395404, 395439, 39549702, 395600, 360 721, 360 722, 369 30, 369 32, G06F 1202, G11B 1722
Patent
active
054918073
ABSTRACT:
A computer system and method for efficiently managing Write Once Read Mostly (WORM) volumes on mass optical storage devices are disclosed. A configuration menu asks the user to enter a threshold percentage from 1-100%. The threshold percentage is multiplied by the volume size to determine a threshold block address. New files are written sequentially to the WORM volume up to but not exceeding the threshold block address, unless a threshold override indicator is enabled. Space on the WORM volume between the threshold block address and the end of the WORM volume is reserved for updated files. Updated files can be stored anywhere on the WORM volume, including above the threshold block address. Reserving space for updated files on a WORM volume allows more updated files to be stored on the same WORM volume as original files, and reduces the number of optical disks required to be read. The threshold percentage can be modified by the user at any time desired
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Freeman Harrison L.
Jaaskelainen William
Mustain Richard G.
Shumway Larry D.
Gossage Glenn
International Business Machines - Corporation
Rose Curtis G.
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