This video teaches the secrets of partitioning a hard drive on a MAC in simple steps. First open the disk utility, select the root directory of your hard drive and click partition. Now select the required partitions under the volume scheme, adjust the drive space and name them. Select the format a MAC OS Extended (Journaled) and select GUID Partition table from option if you want to boot it. Click 'Apply' to start the partitioning and when its done start using it.