SATA Link Power Management (LPM) puts the physical layer (PHY) of the SATA link into a power saving state. SATA Link Power Management is independent of the power state of the hard disk or SSD. This is controlled at the ATA protocol level and, in the case of hard disks for example, leads to a spinning down of the data carrier in order to save power. SATA LPM has led to a significant reduction in the overall power consumption of the SATA subsystem, both in the platform controller hub (SATA controller in the chipset or CPU) and in the SATA device itself. However, LPM is not compatible with hot-plug ^[1]