Back to results
US 11,893,277 B2Granted
Data storage device managing low endurance semiconductor memory write cache
AssigneeWestern Digital Technologies, Inc.
InventorDavid R. Hall
Life of this patent
Estimating the term…
Abstract
A data storage device is disclosed comprising a head actuated over a disk, a first semiconductor memory (SM) having a first endurance, and a second SM having a second endurance lower than the first endurance. A write command is received from a host including write data. When a size of the write command is less than a threshold, the write data is stored in a first SM write cache in the first SM, and when the size of the write command is greater than the threshold, the write data is stored in a second SM write cache in the second SM.
Claims19
A data storage device comprising:
- a disk;
- a head actuated over the disk;
- a first semiconductor memory (SM) having a first endurance, wherein the first SM is distinct from the disk;
- a second SM having a second endurance lower than the first endurance, wherein the second SM is distinct from the disk and the first SM, and wherein the second endurance is based on a number of times the second SM is erased, and the second SM has a block size for garbage collection and erasure;
- and
- control circuitry configured to:
- receive a write command including write data from a host;
- determine a size of write data of the write command;
- when a determined size of the write command is less than a threshold that is based on the block size for garbage collection and erasure of the second SM, store, the write data in a first SM write cache in the first SM;
- and
- when the determined size of the write command is greater than the threshold, store the write data in a second SM write cache in the second SM.
8 more elements
A data storage device comprising:
- a disk;
- a head actuated over the disk;
- a semiconductor memory (SM), wherein the SM is distinct from the disk;
- a non-volatile semiconductor memory (NVSM), wherein the NVSM is distinct from the disk and the SM;
- and
- control circuitry configured to:
- receive a plurality of write commands from a host, wherein each write command includes write data;
- determine a size of write data of the write commands;
- store, based upon the determining, the write commands in a command queue having a command queue depth;
- store flushing, based upon the determining, at least some of the write data in a NVSM write cache;
- and
- throttle use of the NVSM write cache based on at least one of the command queue depth, an average size of the write data, or a write transfer rate of the disk.
9 more elements
A data storage device comprising:
- a disk;
- a head actuated over the disk;
- a semiconductor memory (SM), wherein the SM is distinct from the disk;
- a non-volatile semiconductor (NVSM) comprising a plurality of blocks, wherein the NVSM is distinct from the disk and the SM;
- and
- control circuitry configured to:
- receive a plurality of write commands from a host, wherein each write command includes write data;
- determine a size of write data of the write commands;
- store, based upon the determining, at least some of the write data in a NVSM write cache in the NVSM;
- and
- generate a command execution order for the write commands based on whether flushing the write data of each write command will enable erasing one or more blocks of the NVSM.
8 more elements
A data storage device comprising:
- a disk comprising a plurality of data tracks;
- a head actuated over the disk;
- a first semiconductor memory (SM) having a first endurance, wherein the first SM is distinct from the disk;
- a second semiconductor memory (SM) a second endurance lower than the first endurance, wherein the second SM is distinct from the disk and the first SM;
- and
- control circuitry configured to:
- receive a plurality of write commands from a host, wherein each write command includes write data;
- determine a size of write data of the write commands;
- store, based upon the determining, at least some of the write data in a write cache;
- and
- generate a command execution order for flushing cached write data to the disk, based on a refresh metric of victim data tracks adjacent to data tracks of the disk to which the cached write data are to be written.
8 more elements
Dependencies are inferred from the claim text.