Until recently, one advantage that mainframe systems had over PC-based network solutions was a well-deserved reputation based on their ability to provide safe, secure, reliable and quick direct-access storage devices.
That technology has trickled down to the microcomputer world: The Redundant Arrays of Inexpensive Disks (RAID) drive subsystem architecture allows for data redundancy and protection using multiple drives.
At this time, there more than five levels of RAID implementation, with a few under discussion. The main five implementations are not aggregated levels, where each level builds upon the prior level; rather, they are five different methods of implementation. Recovering RAID 5 is often the easiest.
RAID Level 1 uses mirrored disks to provide complete data redundancy on a one-to-one basis. Each disk has a twin that contains the same data as the primary disk. This is the most common method used in corporate America today.
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