If you're not erasing the disk your Mac started up from, you don't need to start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue. ![]() ![]() Before continuing, make sure that you have a backup of any files that you want to keep. Note: Reformatting the drive will erase all data on the drive, so you should copy any data you want off the drive prior to formatting.Įrasing a disk or volume permanently deletes all of its files. These steps can be used for both internal and external drives. Instructions for how to format your external drive so that it will be fully usable in MacOS. Part 3: Bonus Tip – Data Recovery from Formatted Hard Drive on Mac. Step 2 Follow the steps above to format the drive, and then you can use it with Time Machine on your Mac system. ![]() Step 1 Open Finder, Applications, then go to Utilities and Disk Utility. To format an external hard drive for Mac with Time Machine, you must follow the steps below. Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away or trading in your Mac, you should erase your entire disk.Įrasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.
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