Cable/adapter that adds SATA DevSleep ability?

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DevSleep is a feature used in Enterprise Storages to save even more energy (5mW instead of 0.5 - 2W, depending of the HDD model) if the disk spins down. Does anyone know about an adapter that creates a 3.3v signal after the disk goes sleeping? Like "if 12v is less then 2W then send 3.3v signal, else nothing". For me it sounds like a simple relay. But spinning up the disk would be a problem. ^^


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