BITS 0-3 : RAID Level (RO):
0 : Single Drive
1 : NON-RAID
2 : RAID 0
3 : RAID 1
4 : RAID 3
5 : RAID 4
6 : RAID 5
0xf: NOT DEFINED
BITS 4-6 : Reserved (Set to 0).
BIT 7 : Logical Drive Assignment (R/W):
If CLEAR, Logical Drive is assigned to Primary Controller.
If SET, Logical Drive is assigned to Secondary Controller.