Best Mac Scheme Partition

Note: This will erase all data on your backup disk

Launch Disk Utility

Open a Finder window and navigate to Applications > Utilities and double click on Disk Utility.

The remaining steps vary considerably depending on the operating system you are running. Choose About This Mac from the Apple menu to determine your current OS, then make a selection below.

Instructions for High Sierra, Mojave and Catalina

Watch a video of this tutorial on YouTube
Watch a longer, in-depth tutorial about using Disk Utility

Show All Devices

Disk Utility offers a very simplified view of your devices by default. Unfortunately, this hides the devices that you need to select to modify the partitioning of your backup disk. Before doing anything else in Disk Utility, choose Show All Devices from the View menu, or from the View popup button in Disk Utility's toolbar.

In Disk Utility select your Mac's internal drive, making sure to click on the drive and not the volume beneath it. You should see two tabs below the toolbar: First Aid and Partition. Mac OS X 10.5 and later with no changes to the partition scheme. Follow the instructions until you see a menu bar at the top of the screen,.

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Select the backup disk

Click to select the disk that you would like to use for your backup. This disk should not be the same as your startup disk.

The name of a new disk will often include the manufacturer’s name (e.g. WD My Book 111D Media..). A startup disk will often include the manufacturer's serial number in the title (e.g. TOSHIBA MK50..). Please pay particular attention to selecting the disk, not one of the volumes on the disk. You must select the whole disk to correctly initialize the device.

Unmount any volumes on the backup disk

Disk Utility occasionally has problems with unmounting a volume while attempting to erase it (e.g. because Spotlight prevents the unmount request). Click the Eject button next to any volumes on the disk to preemptively unmount them before erasing the disk.

Erase the backup disk

Click on the Erase button in Disk Utility's toolbar, then configure the name, format, and partitioning scheme of your backup disk. You can set the name to whatever you like, but set the Scheme to GUID Partition Map. If you do not see the Scheme option, go back two steps and select the whole disk device, not one of the volumes on the disk.

Choosing a Format for your destination volume

If your destination device is an HDD with a rotational speed of 5400RPM (or slower): (e.g. 'Slim' backup devices, 2.5' disks) APFS is not a suitable format for these devices, the performance is unacceptable. Choose Mac OS Extended (Journaled) for the format. If you are making a backup of a Catalina startup disk, you should create a from Disk Utility's Edit menu. If you chose another format, select the backup volume, then click the 'Partition' button in Disk Utility's toolbar.

Your new hard drive is now ready to accept backups created by Carbon Copy Cloner!

Instructions for El Capitan and Sierra

Select the backup disk

Click to select the disk that you would like to use for your backup. This disk should not be the same as your startup disk.

The name of a new disk will often include the manufacturer’s name (e.g. WD My Book 111D Media..). A startup disk will often include the manufacturer's serial number in the title (e.g. TOSHIBA MK50..).

Erase the backup disk

Click on the Erase button in Disk Utility's toolbar, then configure the name, format, and partitioning scheme of your backup disk. You can set the name to whatever you like, but set the Format to Mac OS Extended (Journaled) and set the Scheme to GUID Partition Map, then click the Erase button.

Don't Use Time Machine

Click Don’t Use. You may use the same backup disk for both Time Machine and CCC backups, but if you do so, you must use a dedicated partition for the Time Machine backup. Otherwise Time Machine will consume all available space on the backup volume and make it impossible for CCC to use the backup volume.

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Your new hard drive is now ready to accept backups created by Carbon Copy Cloner!

Instructions for Yosemite

Select the backup disk

Click to select the disk that you would like to use for your backup. This disk should not be the same as your startup disk.

The name of a new disk will often include the storage capacity and manufacturer’s name (e.g. 500.07 GB WD My Passp..). A startup disk will often include the manufacturer's serial number in the title (e.g. 320.07 GB TOSHIBA MK3255GSXF Media).

Partition the backup disk

Click on the Partition tab.

Choose 1 Partition from the Partition Layout popup menu (or more if desired).

Click on Options.

Choose GUID Partition Table, then click the OK.

Name the Volume

Format the Volume

Select Mac OS Extended (Journaled) from the Partition Format popup menu.

Click Apply.

Ensure that you have selected the correct disk for your backup drive. This step will delete all data from the selected disk. Click Partition.

Now skip ahead to the remainder of the instructions that are not OS-specific.

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Apr 28, 2007 5:08 AM