OS X Mountain Lion: Partition a disk

Partition a disk

Use Disk Utility to partition a disk into sections, or “partitions,” each of which works like a separate disk. You might want to partition a disk so that you can have different versions of the Mac OS, or to organize your information in a logical manner.

Warning: Partitioning a disk may erase all the files on the disk. If you have any files on the disk you want to save, make sure you copy them to another disk before you partition the disk.
  • To create a partition that contains Windows, use Boot Camp Assistant.
  • To partition a disk for any other reason, see this topic in Disk Utility Help: