drop protection

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drop protection

Techniques employed to reduce damage to a hard disk in a portable device if dropped. For example, foam bumpers can be placed around the drive to absorb impact, and the drive can be mounted to the unit with springs. A piezoelectric sensor can detect sudden motion and cause the hard disk to stop all I/O operations and park the heads. In addition, similar to automobile crumple zones, the external case of the device can be designed to collapse in order to absorb impact and reduce damage to vulnerable components within. See park.
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The new drives feature an unmatched combination of CE-specific features, such as higher capacity on smaller footprints, easier integration with a ZIF connector, industry-first CE-ATA interface, significantly lower power consumption for longer device battery life and industry-leading shock protection through a number of technologies, including a new drop sensor.
Acting like a sixth sense, ESP uses a 3-axis accelerometer -- a type of drop sensor -- to detect a fall in as short as four inches (10 cm).
Developed by Hitachi Metals, the drop sensor component being used on Mikey features the ability to accurately detect a fall from three axes (X, Y, Z) simultaneously.
Head load/unload: Hitachi-patented technology, now widely used throughout the industry, moves the read/write head off disk surface while not operating to reduce incidence of head/disk contact; used in conjunction with drop sensors to comprise ESP technology;
The team hopes to eventually work with other researchers that would use IceMole to drop sensors deep in icy environments.
The other approach is to drop sensors that are connected to the ship by long tethers.