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RAID 1 (SAFE)
—In this configuration, all the data written to one disk is
duplicated on the other disk. This offers greater data protection since if one
disk fails, all your data is still intact on the other disk. However, using RAID
1 means only half of your available disk space is used for data; the other half
is used for a duplicate (mirror) of that data.
You can use RAID 1 only if your device has two disks. If the disks are not
the same size, the smaller of the two disks is used for data, and the larger of
the two disks is used as the mirror. If one disk fails, the other disk continues
to make its data available.
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