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Using a new RAID Volume
After the new RAID volume has been configured or installed a new disk, OS X will
display a pop-up window.
Click the Initialize button to start the disk utility.
Select the RAID volume that has been built, and select Erase on top, name the RAID
volume in the center part, and then select Erase on bottom right of the pane to format
the RAID volume. After formatting, the RAID volume is ready for use.