多项选择题
Which of the following are attributes of a hardware-based RAID controller？（）
A.Backs up data
B.Less expensive than software RAID
C.Vendor neutral implementation
D.Accessible through a BIOS interface
E.More host CPU usage than software RAID
F.Accessible through a system utility after the OS has been loaded
G.May retain data in the event of a power outage
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