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Power-up in standby (PUIS) or power management 2 mode (PM2; Western Digital specific) is a SATA or Parallel ATA (aka PATA) 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 and to avoid a power consumption peak caused by a simultaneous spin-up of multiple disks. PUIS 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 or detected as zero in size. PUIS is typically only supported on RAID controllers. PM2 can usually be enabled by jumpering on the drive but can also be configured by other means (configuration sector) using manufacturer specific tools. ATA Commands for PUIS Usage ''ATA Task File Settings'' Feature = 0x06 - Enable PUIS Feature = 0x86 - Disable PUIS Feature = 0x07 - Spin up drive after power on Command = 0xEF - Set feature == References == * (WD SATA and EIDE Hard Drives Jumper Settings ) * WD Support, (How to enable and disable PM2 (power management) on WD SATA drives ), 2013-11-25 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Power-up in standby」の詳細全文を読む スポンサード リンク
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