User guide

Once you’ve selected the OWC device, you will notice the above change
in the Disk Utility application. Click on the “Partition” tab in this picture.
You then need to choose how many partitions you wish your OWC
Mercury Rack Pro to have. For ease of use we’re selecting one partition
here but of course you could select more if you wish to have multiple
volumes created. Simply use the pulldown menu under Volume Scheme
to create more partitions.
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OWC Mercury Rack Pro Chapter 3 - Formatting