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Hardware Raid

Hardware RAID is using hardware that is dedicated to control the array, instead of doing array control processing using software.

Here is an interesting link
http://www.pcguide.com/ref/hdd/perf/raid/conf/ctrlHardware-c.htmlctrlHardware-c.htmlctrlHardware-c.html

Hardware RAID has better system performance than the Software RAID
See the following link http://www.pcguide.com/ref/hdd/perf/raid/conf/ctrlSoftware-c.html