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DevSlp
DevSlp or DevSleep (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,〔(【引用サイトリンク】title=Tom's Hardware review of BIWIN announcement of using DevSlp )〕 but some drives can get as low as 2.5 mW〔(【引用サイトリンク】title=Tom's Hardware review of the Transcend SSD340 )〕). The feature was introduced by SanDisk〔(【引用サイトリンク】title=Toms Hardware DevSlp initiative )〕 in a partnership with Intel.〔(【引用サイトリンク】title=StorageReview coverage of DevSlp standard )〕 Some think that the initiative could make laptops feel like they power on basically instantaneously,〔(【引用サイトリンク】title=Techspot review of feature )〕 while others state that this means that laptops can stay on all the time, and always be available with no adverse effects on battery life.
In traditional low-power modes, SATA link still needs to remain powered on to allow the device to receive a wake-up command. With DevSlp, rarely used 3.3 V pins of the SATA power plug will be used for the DevSlp signal instead of providing 3.3 V power. This signal can wake up the drive, and it will allow SATA link to be shut down, reducing further the power consumption.〔(【引用サイトリンク】title=c′t Hotline SSD mit "Devsleep"-Funktion (German article) )〕
Due to the way they work, DevSleep-enabled drives may not be suitable for most desktop PCs and some notebooks with the 3.3 V voltage present in their SATA power connectors; the presence of 3.3 V results in DevSleep-enabled drives remaining in DevSlp state.〔 An incompatibility between a desktop mainboard and a SATA SSD may be resolved by disabling the DevSleep feature using a power connector adapter that does not pass the +3.3 V line.
== References ==
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「DevSlp」の詳細全文を読む
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