Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the internet.

Command (⌘)-R: Start up from the built-in macOS Recovery system.

Keep holding until the described behavior occurs. And you don’t have to spend a dime to do it.To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. In the meantime, with this tool at your disposal you can resize partitions on-the-fly, rather than having to copy data back and forth to an external drive. This new command is a work in progress and will probably see changes when OS X 10.5 arrives. Unfortunately, the error messages won’t go into any detail. If you have any system or special metadata files-which can’t be moved-in the section of your partition that you wish to reallocate, the command will also fail. If it encounters any disk problems, it will stop, and you’ll need to run Disk Utility or another disk-maintenance program. You cannot resize FAT32 partitions with theĬommand occasionally fails.

You now have two Mac partitions and one FAT32 partition. To split the Mac partition from the previous example in two again, for example, you could run this command:ĭiskutil resizeVolume disk2s2 65G JHFS+ Part2 65G To make sure you know which identifier to use-the partition numbers have probably changed. So if you split a 232GB partition, the above command would give you a first partition of 100GB and a second partition of 132GB. If there’s more empty space in the partition, the command will use it all. Then it creates a new, second partition, named Part2, using the journaled HFS+ format, with a minimum size of 100GB. It specifies a size of 100GB for the first partition. This command splits a single partition in two. Here’s an example of a slightly more complicatedĭiskutil resizeVolume disk2s2 100G JHFS+ Part2 100G In Terminal for more information on this command.)

To make a bootable partition for Windows, you must use theĬommand, which will destroy all data on it. TheĬommand will resize your disk, partition it, and format it to use MS-DOS, but it can’t install an MBR (Master Boot Record) on the disk. You cannot create a bootable partition for Boot Camp using this command. For example, to create a 100GB partition in journaled HFS+, you’d type You must specify the size for each partition.

How to boot into disk utility mac 10.4