Most drives are formatted into a single partition, so you will normally see only one entry underneath a physical drive entry. What appear underneath the physical drive are the individual partitions. When you see the drives listed down the right hand side of the Disk Utilities window, you will see at least two entries for each physical hard drive. You must still be careful in your selection of which drive to format, as you certainly don’t want to format one of your internal drives. That way you will protect yourself from inadvertently re-formatting the wrong drive. For this exercise, it is best to DISCONNECT any and all external storage devices, so you only have the one that you wish to format connected. You will see your internal drive in your Mac, as well as any other storage devices that are connected. Then open the Disk Utility that is located in the Utilities folder of your Applications folder. There is one trick to it that is not intuitive.įirst… Plug the drive in to your Mac. How do I do that?Īnd you know what? It’s not nearly as easy as it should be! If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device.I get this question a lot – I have an external hard drive that is NTFS formatted (Windows format), and I want to reformat it for my Mac (HFS). Secure erase options are available only for some types of storage devices. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. 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.Ĭlick the Format pop-up menu, then choose a file system format. Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. In the sidebar, select the storage device you want to erase, then click the Erase button. If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder. Note: If you want to get your Mac ready to trade in, sell, or give away, and your computer is a Mac with Apple silicon or an Intel-based Mac with an Apple T2 Security Chip, use Erase Assistant.
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