Method For Implementing a RAID Drive Array Using a Single Physical Drive
Original Publication Date: 2005-Jan-21
Included in the Prior Art Database: 2005-Jan-21
Currently hard drives can be arranged in a RAID 0 drive array using two or more drives. This is done to increase the speed at which data is read from the drive through data striping. All current RAID systems require two or more complete physical drives to function. This increases costs as the drive platters, motors, control logic boards, power supplies, and cases are all duplicated across multiple drives. This also increases the possibility that any individual drive will fail, as the number of failure-prone components is increased. This invention describes a method to construct a drive such that a RAID 0 array can be implemented using a single drive. The two key aspects to the invention are: - Add a secondary drive read/write arm to the opposing side of the drive - Partition the data on the drive into two halves, an inner ring and an outer ring. Conventional drives have a single arm that swings across all the platters of the drive to position the drive read/write heads over the data tracks. By adding a second, independent drive arm, two tracks can be read or written at the same time, just as in a multiple drive RAID installation.