Cache control method for hybrid HDD, related program, and hybrid disk drive using same
AssigneeSeagate Technology LLC
InventorHye-jeong Nam
Life of this patent
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Abstract
A cache control method for a hybrid hard disk drive (HDD) comprising a nonvolatile cache (NVC) and a hard disk. When the hybrid HDD is operating in a non-parallel mode of operation, the control method sequentially searches the NVC and then reads the hard disk for requested data, but when the hybrid HDD is operating in a parallel mode of operation, the control method simultaneously searches the NVC and reads hard disk for the data requested.
Claims19
A cache control method for a hybrid hard disk drive (HDD) comprising a nonvolatile cache (NVC) and a hard disk, the cache control method comprising:
- when the hybrid HDD is operating in a non-parallel mode of operation, sequentially searching the NVC and then reading the hard disk for requested data;
- and
- when the hybrid HDD is operating in a parallel mode of operation, simultaneously searching the NVC and reading hard disk for the data requested.
A computer-readable recording medium storing a program, the program implementing a cache control method for a hybrid hard disk drive (HDD) comprising a nonvolatile cache (NVC) and a hard disk, the cache control method comprising:
- when the hybrid HDD is operating in a non-parallel mode of operation, sequentially searching the NVC and then the reading hard disk for requested data;
- and
- when the hybrid HDD is operating in a parallel mode of operation, simultaneously searching the NVC and reading hard disk for the data requested.
A hybrid hard disk drive (HDD) comprising:
- a nonvolatile cache (NVC);
- a hard disk;
- and
- a controller adapted to sequentially search the NVC and then the read hard disk for requested data when the hybrid HDD is operating in a non-parallel mode of operation, but simultaneously search the NVC and read hard disk for the data requested when the hybrid HDD is operating in a parallel mode of operation in response to a read command received from a host system.
Dependencies are inferred from the claim text.