Partitioning a Mac hard drive means to split the hard drive into two or more separate drives. A partitioned hard drive can be handy for running two operating systems on one Mac, like running Mac OS X on one and Windows on another. However, it also means the overall size of both hard drives will be smaller. In order to restore the hard drives to their original singular form you have to merge them together. As long as you have Mac OS X 10.5 or higher you can easily merge hard drives on a Mac. Tips Warnings Writer Bio
