In this video tutorial, viewers learn how to partition an external hard drive on a Mac computer. Begin by open Macintosh HD. Scroll down the list on the left and click on Applications. Double-click on Utilities and select Disk Utility. Under Volume Schemes, select 2 Partitions. Select the name of the partition and choose the format that you want for the drive. Select the second partition and do the same. Now click on Apply and click on Partition. This video will benefit those viewers who use a Mac computer and would like to learn how to partition an external hard drive to separate the drive into 2 drives.