Hitachi 220H Bios Manual page 95

4. The following window is displayed.
Click physical drives in Drives pane for building virtual drive.
If you add a virtual drive to the already existing Drive Group, select nothing
and go to the step 7.
The number of drives required varies depending on the RAID level to be set.
The following table summarizes the number of drives required.
Table 2-14: Number of drives required
RAID level
RAID 0 (including JBOD)
RAID 1
RAID 5
RAID 6
RAID 6 with three physical drives and RAID 1 with three or more
physical drives are not supported. If you configure those settings,
the virtual drive may not operate properly.
You can select only a drive which status is "Unconfigured Good"

(unused).
To select multiple drives, click the drives while pressing Ctrl

key.
Hitachi Compute Rack 210H/220H BIOS Guide
Number of drives required
One or more
Two
Three or more
Four or more
MegaRAID WebBIOS 2-31