OWC Mercury Rack Pro 4 Bay Storage Enclosure Owner's Manual page 16

4
Once Disk Utility opens, you will see a screen that looks similar
Step
to this - note the 4 individual hard drives shown on the left side,
all unformatted with no volumes listed.
5
Click on the first hard drive in the list that has no volume, as
Step
shown above.
7
You will see the above box appear in the middle of the screen.
Step
Right click on the first unallocated volume that you wish to
format. Select "New Simple Volume".
8
The New Simple Volume Wizard will launch. Click Next.
Step
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