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Single-Drive Performance with SoftRAID 5
Related: hard drive, RAID, RAID-4, RAID-5, SoftRAID, storage, Thunderbolt, video
The spike at end has to do with either OS X or drive block mapping behavior. These hard drives are very fast and represent very high performance for hard drives. One of the eight is a laggard.
The decline in speed over the capacity is as expected for hard drives (rotational data density).
disktester run-area-test --iterations 5 --test-size 4G --delta-percent 5