| 摘要 |
A data storage device includes a plurality of main hard disk drives (HDD), at least one standby HDD, and a Redundant Array of Independent Disks (RAID) controller. The RAID controller controls all the plurality of main HDDs to form an RAID array that serve as a virtual single hard disk drive for storing data. When any one of the plurality of main HDDs malfunctions, the RAID controller adds the standby HDD to the RAID array to replace the malfunctioning main HDD.
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