Power-up in standby

Power-up in standby

Power-up in standby (PUIS) or power management 2 mode (PM2) is a SATA hard disk configuration which prevents the drive from automatic spinup when power is applied. The spinup occurs later by an ATA command, only when the disk is needed, to conserve electric power.

PM2 requires corresponding BIOS support. If PM2 is enabled on the drive but not supported by the BIOS, the drive will not be detected by the system.

PM2 can usually be enabled by a jumper shunt on the drive.


* [http://www.wdc.com/en/library/eide/2579-001037.pdf WD SATA and EIDE Hard Drives Jumper Settings]

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