Unfortunately, this hides the devices that you need to select to modify the partitioning of your backup disk. Watch a video of this tutorial on YouTube Show All Devicesĭisk Utility offers a very simplified view of your devices by default. Instructions for Big Sur, Catalina, Mojave, and High Sierra
macOS 10.12 Sierra and OS X 10.11 El Capitan.macOS 11Big Sur, 10.15 Catalina, 10.14 Mojave, and 10.13 High Sierra.Choose About This Mac from the Apple menu to determine your current OS, then make a selection below. It is recommended that you choose the APFS disk format.The remaining steps vary considerably depending on the operating system you are running. Click the Erase button in the toolbar and specify the volume name and formatting. If there are several volumes, you can format them separately. Then select how many partitions you need, and specify the name, formatting and size for each of them.įormatting erases all data on your disk or a volume (depending on what is selected). To partition your disk, select it and click the Partition button. Choose GUID Partition Map to make the disk bootable. To choose the partition map scheme, select the disk (not a volume) and click the Erase button. It is recommended that you backup your data before making any changes. Partitioning can erase all data on your disk. Its format will be indicated right below the volume name in the upper section of the main window.Īlso, you can click the Info button in the toolbar to get more details. If the sidebar displays only volumes, select the View > Show all Devices in the main menu. The partition map scheme is indicated in the table. Select your disk (not a volume) in Disk Utility. Finding out the current partition map scheme Finding out the current partition map schemeįor all tasks described here, use the Disk Utility application located in the Applications/Utilities folder.Cloning Disks Partitioning and Formatting your Disk
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