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Staggered spin-up is a physical performance strategy for serial ATA hard disk drives or RAID DISK drive systems. With staggered spin-up, engineers handle the electrical load and system capacity during startup by staggering the times when disk drives begin input/output (I/O) operations.
With the traditional strategy, all drives spin up when device or system power is turned on, but staggered spin-up delays the spin up of some drives to provide a more stable demand to the power supply.