DevSlp
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DevSlp (sometimes referred to as device sleep or SATA DEVSLP) is a feature in some SATA devices which allows them to go into a low power "device sleep" mode when sent the appropriate signal, which uses one or two orders of magnitude less power than a traditional idle (about 5 mW,[1] but some drives can get as low as 2.5 mW[2]). The feature was introduced by SanDisk[3]
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