Creating a RAID array out of cheap USB disks

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A RAID array is a bunch of disks used together in co-operation to create a redundant storage facility. Hard drives are mechanical devices with moving parts, which makes them prone to failure. You can imagine what it means to spin the hard drive platters at 7200 rpm, for years without a pause in a typical server setup. Eventually, all disks die. A disk may run for a decade without a hinge, but another disk of the same type may die after a year. The problem is, there is reliable way to predict when a particular disk dies.

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