![]() ![]() For the best result, select the disk (the highest option in the external tree). You can find this on the left-hand side of the screen under External Hard Drives. Click the external hard drive you want to format. If you used Disk Utility from macOS Recovery, you can now restart your Mac: choose Apple menu > Restart. Then click View in the top-left corner of the window and select Show All Devices. The order of repair in this example was Macintosh HD - Data, then Macintosh HD, then Container disk4, then APPLE SSD. Keep moving up the list, running First Aid for each volume on the disk, then each container on the disk, then finally the disk itself. If you're asked for a password to unlock the disk, enter your administrator password.Īfter Disk Utility is done checking the volume, select the next item above it in the sidebar, then run First Aid again.If the button is dimmed and you can't click it, skip this step for the disk, container, or volume you selected.Step 3: As you click on the Erase button, you will see several fields in the section. Step 2: From the left side panel, pick the volume or the drive that you want to format and switch to the Erase tab. If there is no Run button, click the Repair Disk button instead. Step 1: Connect the USB drive or external drive to Mac and launch the Disk Utility from Applications.In this example, the last volume on the disk is Macintosh HD - Data.Ĭlick Run to begin checking the selected volume for errors. Then, connect the portable hard drive to it and wait until its recognized. ![]() Keep the name 'Macintosh HD' and set the format to 'APFS' or 'Mac. Step 1: Install and launch Partition Assistant on your computer. In the dialogue box, you need to rename the drive and format. The easiest way to do that is hit CMD and the spacebar at the same time and type in 'Disk Utility' to. For each disk that you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab. Choose 'Macintosh HD' on the left side of the screen. How to format an external drive in OS X 1.
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