System and method for emulating disk tracks to maintain data format compatibility
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United States of America Patent
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-
Dec 31, 1996
Issued Date -
N/A
app pub date -
Jun 14, 1994
filing date -
Nov 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a disk track emulation system and method, whereby, when a disk device is replaced by a new disk device having a disk track with a data format different from that of the conventional device, a program in a conventional host device can be used as it is, in the same way as in the conventional disk device, without reforming the program. To maintain the a compatibility, using the characteristic that the data format is divided by a unit called a cell having a constant number of bytes, and writing, into a home address area and a count area in the new data format, cell position data with the new data format, and compatible cell position data with respect to the conventional data format in which the compatibility should be maintained.
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