Data to access files in an optical disk are copied to a hard drive where the data are maintained even upon removal of the disk
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United States of America Patent
Stats
-
Nov 7, 1995
Grant Date -
N/A
app pub date -
Nov 25, 1991
filing date -
Nov 30, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A data management method and apparatus used for a filing system in which management data is copied from an optical disk to a hard disk to manage image data stored in the optical disk. Hereupon, the optical disk has a storage capacity larger than that of the hard disk, but has an access time longer than that of the hard disk. Whenever new image data is recorded on the optical disk, new management data corresponding to the new image data is recorded on the hard disk, accordingly. The new image data is not copied from the hard disk to the optical disk until the management data on the hard disk satisfies a predetermined condition. That is, the new image data is not copied whenever the optical disk is ejected from an optical disk storage in the filing system. The new image data is to be recorded on the optical disk for many times. In addition, there occurs a case where it is necessary to use the optical disk for another filing system before all the image data is recorded thereon. Accordingly, the new image data is put together (accumulated) and then copied to the optical disk. Thus, the filing system can serve the average time for recording the new image data on the optical disk.
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