When you need to run a different version of the operating system–say, for testing, or to use older software that won't run under a newer OS–open the Startup Disk pane of System Preferences, select the partition you want, and click on Restart.
#HOW TO PARTITION AN EXTERNAL HARD DRIVE MAC WITH IPARTITION INSTALL#
Divide your disk into one partition for each version of OS X, and then install the operating systems separately. If your Mac is capable of running multiple versions of OS X (for example, you have an early Intel-based iMac that can run Tiger, Leopard, or Snow Leopard), you can partition your drive so that you can use more than one. So why would you ever bother? Here are five good reasons: Partitioning can waste space and even decrease your hard drive's performance. I know some people who have partitioned their Macs' hard drives for decades, but can't really give a good reason for doing it. You can also choose from several third-party utilities, such as Prosoft Engineering's $99 Drive Genius 2 and Coriolis System's $45 iPartition that can change a drive's partitioning without erasing it. You can use Disk Utility (found in /Applications/Utilities) to repartition a drive, although doing so normally requires erasing the entire drive in the process.
Any internal (IDE or SATA) or external (FireWire, USB, or eSATA) disk can be reorganized into one or more volumes called partitions.Įach partition appears on your Desktop as an independent disk, and you can even mix and match formatting methods from one partition to the next on the same disk. If the need arises, you can split that disk up.
When you get a new Mac, it comes with one startup drive (a hard disk or, in a few cases, a solid-state disk) named “Macintosh HD.” This arrangement is perfectly fine for most of us, but it's not your only option.
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