![]() ![]() Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources. In at least one model of Intel-based laptop, the MacBook Pro 15", Apple uses the Kionix KXM52-1050 three-axis accelerometer chip, with dynamic range of +/- 2g and bandwidth up to 1.5 kHz. the dynamic range was close to 6-bit), while the sensor used in the current Intel-based laptops have an 8-bit resolution (250 scale divisions). The sensor used in the G4-based laptops resolved shifts of 1/52 g (e.g. A clicking noise can be heard when the sudden motion sensor activates.īroadly speaking, there have been two types of Sudden Motion Sensor. When the computer is stable, the drive operates normally again. The system disengages the disk drive heads from the hard disk platters, preventing data loss and drive damage from a disk head crash. With a triaxial accelerometer, the shock detector detects sudden acceleration, such as when the computer is dropped, and prepares the relatively fragile hard disk drive mechanism for impact. Since that time, Apple has included the system in all of their non- SSD portable systems (since October 2006), now the MacBook Pro and MacBook Air. Apple introduced the system Januin its refreshed PowerBook line, and included it in the iBook line July 26, 2005. The Sudden Motion Sensor (SMS) is Apple's motion-based data protection system used in their notebook computer systems. Please help update this article to reflect recent events or newly available information. ![]() The reason given is: the article is missing information about the SMS not being included in Macs with a solid-state drive. ![]()
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