OWC Mercury Elite-AL Pro Owner's Manual page 8

OWC Mercury Elite-AL Pro Dual Bay eSATA
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Once you've selected the OWC device, you will notice the above change in the Disk
Utility application. Click on the "Erase" tab in this picture.
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You then need to name the volume that you want to format, and erase it. Name the
volume as you want, choose the Volume Format pulldown (Mac OS Extended (Jour-
naled) is default), and click the Erase button.
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Chapter 3 - Formatting