Acronym: Redudant Array of Independent Disks
RAID systems allow for both an effective, real-time backup as well as for an increase in overall hard drive speed, letting two (or more) hard drives act like a single device that is twice as fast. They are generally made up of identical or nearly identical drives.
Unlike most computer systems, hard drive space is generally more important than speed. As such, many computer components are slowed down by their disproportionately slow hard drive. They often become the bottleneck on many systems and, as a result, RAID systems have become increasingly popular.
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