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HGST Ultrastar He8 Performance: RAID-0 Striping
RAID 0 is the highest performance RAID mode, striping (simultaneously initiating) reads and writes across multiple drives.
RAID-0 striping requires two or more drives. Ideally, performance should scale linearly: N drives should be N times as fast as a single drive.
RAID-0 sustained transfer speed
DiskTester run-sequential used to test peak speed of empty volume, freshly erased. Throughput figures are real-world figures through the OS X file system.
It doesn’t get any better than this: perfect straight-line linear RAID-0 scalability: five drives are five times as fast as a single drive.