Reformat external hard drive mac5/21/2023 ![]() To find it quickly, do a search for Disk Utility in the spotlight (magnify glass) icon on the. You'll see the MacOS Utilities window choose "Disk Utility." Now you can choose to erase your startup drive, and choose "Mac OS Extended (Journaled)" as the operating system. To reformat a hard drive or USB stick first open Disk Utility. In the window that appears, select the format and click Erase. If necessary, first copy your important data. Important note: All your data on the external disk will be erased. To get around that problem, hold down the Command + R keys when you turn on your Mac and let go when the logo appears. Steps for how to format an external drive on a Mac Open the default Apple application called Disk Utility. ![]() If you want to format your Mac's system drive, you can't do that when the Mac is running normally because the drive is in use by the operating system. Usually, you'll want ExFAT, which is the default for the MacOS. Select the drive you want to format and then choose “Erase.”Ĥ. At the top of the window, click "Erase."ĥ. In the pop-up window, choose the file system you want to use.
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