MSI MS-9228 User Manual page 75

MSI Reminds You...
Since you want to create two volumes (Intel Matrix RAID Technology),
this default size (maximum) needs to be reduced. Type in a new size for
the first volume. As an example: if you want the first volume to span the
first half of the two disks, re-type the size to be half of what is shown by
default. The second volume, when created, will automatically span the
remainder of two hard drives.
6. Then the following screen appears for you to confirm if you are sure to
create the RAID volume. Press <Y> to continue.
7. Then the following screen appears to indicate that the creation is finished.
Intel ICH6R SATA RAID
A-5