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Restore the first 9Gb partition with your Mac OS X 10.6 Snow Leopard disk image, using disk utility. 2 partitions with the remaining space, the first one being your current snow leopard partition, the second one being your target for the Lion install. 2 partitions of 9Gb at the end of your drive, the first one for a fallback emergency Snow Leopard installer, the second one for the Lion installer An external hard drive, to backup your computerĭo a full backup of your computer with TimeMachine.ĭepending on your drive capabilities, use disk utility to partition your drive that way: A Mac OS X Lion Developer Preview 1 copy (there's a bay full of pirates that can be useful.) An intel core duo/solo Mac computer (MacBook, Mac mini.) running Snow Leopard

Click Apply - the following will be displayedPlease note that this tutorial is totally worthless since the Lion beta does not include most of the feature included in the final version.

Click the Options button and select GUID Partition Table.

Set Format to Mac OS Extended (Journaled).

Under Partition Layout, select 1 Partition.

NOTE: If you don't see the Partition tab then the volume is selected, not the drive

Select the Partition tab on the right-hand side of the window.

Select the drive on the left showing the capacity.

To open Disk Utility - Open Finder > Applications > Utilities > Disk Utility IMPORTANT: Reformatting the drive will erase all data on the drive, so you should copy any data you want off the drive prior to formatting.

Click here to see other formatting options for your operating system.

Looking for a different formatting option? If you need to go between macOS and Windows format your drive ExFAT on macOS

Mac OS Extended (Journaled) does not work natively with Windows.It is required when using Time Machine for the operating systems listed earlier.It is important to keep the following in mind when formatting Mac OS Extended (Journaled): Not seeing your version of macOS? Click here to see other versions of macOS and different formatting options.

Not sure which version you are using? Click here to determine your version of macOS.

IMPORTANT: This article applies to the following Mac OS X versions: