Hybrid drive writing extended error correction code symbols to disk for data sectors stored in non-volatile semiconductor memory
AssigneeWestern Digital Technologies, Inc.
InventorsMei-Man L. Syu, Virgil V. Wilkins, Alan T. Meyer
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Abstract
A hybrid drive is disclosed comprising a head actuated over a disk, and a non-volatile semiconductor memory (NVSM). A write command is received from a host, the write command comprising data. First and second error correction code (ECC) symbols are generated over the data, wherein the second ECC symbols are different than the first ECC symbols. The data and first ECC symbols are written to the NVSM, and the second ECC symbols are written to the disk.
Claims26
A hybrid drive comprising:
- a disk;
- a head actuated over the disk;
- a non-volatile semiconductor memory (NVSM);
- and
- control circuitry operable to:
- receive a write command from a host, the write command comprising data;
- generate first error correction code (ECC) symbols over the data;
- generate second ECC symbols over the data, wherein the second ECC symbols are different than the first ECC symbols;
- write the data and first ECC symbols to the NVSM;
- and
- write the second ECC symbols to the disk.
A method of operating a hybrid drive, the hybrid drive comprising a disk, a head actuated over the disk, and a non-volatile semiconductor memory (NVSM), the method comprising:
- receive a write command from a host, the write command comprising data;
- generating first error correction code (ECC) symbols over the data;
- generating second ECC symbols over the data, wherein the second ECC symbols are different than the first ECC symbols;
- writing the data and first ECC symbols to the NVSM;
- and
- writing the second ECC symbols to the disk.
Dependencies are inferred from the claim text.