Engineering: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,[1] but some drives can get as low as 2.5 mW[2]). The feature was introduced by SanDisk[3] in a partnership with Intel.[4] Some think that the initiative could make laptops feel like they power on basically instantaneously,[5] 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.[6]
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.[7]
External links
References
- ↑ Niels Broekhuijsen (2 June 2013). "Tom's Hardware review of BIWIN announcement of using DevSlp". Tom's Hardware. http://www.tomshardware.com/news/BIWIN-mSATA-SSD-Efficient-M5301,22839.html.
- ↑ Christopher Ryan (28 July 2014). "Tom's Hardware review of the Transcend SSD340". Tom's Hardware. http://www.tomshardware.com/reviews/transcend-ssd340-jmicron-jmf667h-performance,3820-10.html.
- ↑ Kevin Parrish (13 September 2011). "Toms Hardware DevSlp initiative". Tom's Hardware. http://www.tomshardware.com/news/SATA-DEVSLP-Initiative-50mW-low-power,13419.html.
- ↑ "StorageReview coverage of DevSlp standard". http://www.storagereview.com/intel_and_sandisk_join_forces_for_new_sata_devslp_standard_idf_2011.
- ↑ "Techspot review of feature". TechSpot. 16 July 2013. http://www.techspot.com/news/53246-sata-devsleep-getting-us-closer-to-instant-on-laptops.html.
- ↑ Brad Chacos (6 January 2012). "New Power-Saving DevSleep Feature Added To SATA Specification". http://www.maximumpc.com/article/news/new_power-saving_devsleep_feature_added_sata_specification. Retrieved 8 July 2015.
- ↑ "c′t Hotline SSD mit "Devsleep"-Funktion (German article)". c't. 25 June 2014. http://www.heise.de/ct/hotline/SSD-mit-Devsleep-Funktion-2238150.html.
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