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RAID1 (Mirroring):
A RAID1 array mirrors data written to the two hard drives equally. The
capacity of the array is equal to the smallest capacity drive in the array.
Storage speed is same as a single drive. The advantage of RAID1 is that if any
hard drive fails the other drive will still carry all data written to the drives. Its
deficit is that the maximum capacity of the array is equal to the smallest drive
in the array..
Note: For very important material, such as databases or personal data, this is
an absolutely safe storage solution.