Non-volatile hard disk drive cache system and method
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United States of America Patent
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Jan 12, 2016
Grant Date -
Jan 1, 2015
app pub date -
Sep 12, 2014
filing date -
Sep 1, 2005
priority date (Note) -
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Abstract
A non-volatile hard disk drive cache system is coupled between a processor and a hard disk drive. The cache system includes a control circuit, a non-volatile memory and a volatile memory. the control circuit causes a subset of the data stored in the hard disk drive to be written to the non-volatile memory. In response to a request to read data are stored in the non-volatile memory. If so, the requested read data are provided form the non-volatile memory. Otherwise, the requested read data are provided from the hard disk drive. the volatile memory is used as a write buffer and to store disk access statistics, such as the disk drive locations that are most frequently read, which are used by the control circuit to determine which data to store in the non-volatile memory.
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