Non-volatile hard disk drive cache system and method

Details Non-volatile hard disk drive cache system and method Non-volatile hard disk drive cache system and method

2011-06-21

2011-06-21

Choe, Yong (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S102000, C711S118000, C711S128000, C714S005110

Reexamination Certificate

active

07966450

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 from the hard disk drive, the control circuit first determines if the requested read data are stored in the non-volatile memory. If so, the requested read data are provided from 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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