Click the Format pop-up menu, then choose APFS.In the sidebar, select the internal disk device you want to erase, then click the Erase button.You may need to configure certain settings again, such as Time Machine.Īfter setting the external SSD as the startup disk and migrating your data, you can erase the internal disk. Next, rename your internal disk to a name other than Macintosh HD. Click the icon of the disk you want to use, then click Restart. In earlier versions of macOS, choose Apple menu > System Preferences, then click Startup disk. In macOS Ventura or later, Choose Apple menu > System Settings, click General in the sidebar, then click Startup disk on the right. Large transfers might need several hours to complete.Īfter Migration, change your startup disk to set the external SSD as the default startup disk. Select your Time Machine backup or internal hard disk, then click Continue. When asked how you want to transfer your information, select the option to transfer from a Mac, Time Machine backup, or startup disk. When your Mac restarts to the external SSD, follow the prompts in Setup Assistant. Use Migration Assistant to copy all of your documents, apps, user accounts, and settings to the external SSD from the internal disk or your Time Machine backup. MacOS Catalina is compatible with these computers MacOS Big Sur is compatible with these computers MacOS Monterey is compatible with these computers MacOS Ventura is compatible with these computers When the installer opens and you're asked to choose where to install, click Show All Disks, then select the new external SSD before continuing. You can download macOS here: How to download macOS - Apple Support. Your Mac will restart, and it might show a progress bar or blank screen several times. macOS updates and upgrades help to maintain your computer's security, stability, and compatibility, and they include the latest features and built-in apps.īefore installing, it’s a good idea to back up your Mac. While installing, avoid putting your Mac to sleep. (If APFS is not shown, choose GUID Partition Map first, then change the format to APFS.)Īpple recommends using the latest (newest) macOS that is compatible with your Mac. (If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to erase-it’s at the top of the hierarchy.) Click the Scheme pop-up menu, then choose GUID Partition Map.In the sidebar, select the external SSD device you want to erase, then click the Erase button.(Disk Utility is located in the /Applications/Utilities folder.) Alternatively, click Launchpad in the Dock, type Disk Utility in the search field, then click the Disk Utility icon. In the Finder, choose Go > Utilities, then double-click the Disk Utility icon.Erasing a storage device deletes everything on it. In Disk Utility on Mac, you can erase and reformat the external SSD to use with your Mac. If you purchase an external SSD other than what is recommended above, check with the manufacturer to find out if it uses USB 3.2 technology and can be used as a startup disk for a Mac computer.Ĭonnect the external SSD to your Mac using the cable that came with it, or if the cable doesn’t have a connector that fits in your Mac, use an adapter cable. If you have an iMac (Late 2015) and earlier or a Mac mini, you'll need a USB-C to USB-A adapter cable, such as the Belkin 3.1 USB-A to USB-C Cable, to connect to this SSD with your Mac.Īlthough many external SSDs may work as an external SSD startup disk for Mac, some may not have the correct connection or startup disk functionality. An external SSD should utilize USB 3.2 technology and have the functionality of being used as a startup disk for Mac.Ī recommended external SSD, sold from the Apple Store, is the LaCie Mobile SSD Secure USB-C Drive - Gray - Apple. It's important to use an external SSD with enough storage for your documents, photos, music, and apps, as well as extensive video libraries and large data files. These Mac models are compatible with using an external SSD. Learn how to update the software on your Mac. Using an external SSD as a startup disk is supported by any Mac with an Intel processor with an Apple hard disk or Fusion Drive, with USB 3 ports, running macOS High Sierra 10.13 or later. An external SSD as a startup disk can give your Mac additional performance for system responsiveness, apps, startup, and more. Your USB 3-equipped Mac with a hard disk or Fusion Drive can have improved system performance by connecting to an external solid-state drive (also known as an SSD). Learn how to use an external SSD as a startup disk with your iMac or Mac mini computer.
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