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4.
Click on the drop-down arrow at “Volume Scheme”. Then, choose the number of
partitions you want for this drive. Under Mac OS, you must choose at least one
partition. You may input a name and select various Format options under Volume
Information. “Mac OS Extended (Journaled)” is the default and the
recommended as well. Then, click on “Partition”. (For USB flash drive, you only
need to perform one partition and choose Mac OS extended (Journaled).)