OS X Mountain Lion: 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.
- 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: