System including a plurality of data storage devices...

Details System including a plurality of data storage devices... System including a plurality of data storage devices...

2007-10-02

2011-12-13

Riad, Amine (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

Reexamination Certificate

active

08078921

ABSTRACT:
Embodiments of the present invention help improve the process for updating parities accompanied by the writing process. According to one embodiment, a host controller transmits a write command and new data to a hard disk drive (HDD). The HDD reads old data at a region where the new data are to be written. The HDD then XORs the new data and the old data to generate a pseudo-parity. The HDD sets the pseudo-parity in a data frame addressed to both of a horizontal parity disk drive HDD and a diagonal parity disk drive HDD and transmits it. The horizontal parity disk drive HDD and the diagonal parity disk drive HDD update the parities using the pseudo-parity.

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