GPS has a variety of applications on land, at sea and in the air. The most common airborne applications are for navigation by general aviation and commercial aircraft. At sea, GPS is also typically used for navigation by recreational boaters, commercial fishermen, and professional mariners. Land-based applications are more diverse. GPS is now commonplace in automobiles as well. Some basic systems are in place and provide emergency roadside assistance at the push of a button (by transmitting your current position to a dispatch center). More sophisticated systems that show your position on a street map are also available.
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This is the type of connection required to download music from your PC to the MP3 player. Some models offer more than one interface type for maximum flexibility.
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Spindle speed is the speed at which the drive's memory disc (or platter) spins. A higher spin rate improves both positioning and transfer performance for sequential operations. This means that the faster it spins, the faster data can be read off of the disk for single operations.
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The interface is the type of connection (such as FireWire or USB) used by your hard drive. Home systems will mostly use an IDE interface. Professional systems can use higher quality interface, as SCSI.
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Internal Data Transfer Rate provides the best overall measurement of a drive's performance. The number represents how quickly data is read within the hard drive itself.
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