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Bitmap
Bitmap improves the time for RAID rebuilding after an unexpected error, or removing or
re-adding a member hard drive of the RAID configuration. If an array has a bitmap, the
member hard drive can be removed and re-added and only blocks changes since the
removal (as recorded in the bitmap) will be re-synchronized. To use this feature, select a
RAID volume and click “Enable Bitmap”.
Note:
Bitmap support is only available for RAID 1, 5, 6, and 10.