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- Click the Erase tab. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions. Select your Mac OS X volume. Highlight the drive, select Partition Tab, then Format type.
- The best way to restore your Mac to factory settings is to erase your hard drive and reinstall macOS. After macOS installation is complete, the Mac restarts to a setup assistant that asks you to choose a country or region. To leave the Mac in an out-of-box state, don't continue setup. Instead, press Command-Q to shut down the Mac.
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Most users use Disk Utility to erase a disk or hard drive. But some Mac users might need to erase them from the command line on Mac OS. To do that, the only thing you need is a bit of precise syntax to make sure that you are erasing the proper disk.
Here I'll show you how you can erase and format a disk using the command line.
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Working with Terminal
Start off by running the following command in the command line: Diskutil list
This is going to list all the mounted drives on your Mac.
Once you have found the proper drive to erase, just copy its identifier so you can use it for the next command. Then pick a name and a system format type. This is the syntax we need: Diskutil eraseDisk FILESYSTEM DISKNAME DISKIDENTIFIER
Let’s say the disk I want to erase has “/dev/disk5s2” as its identifier and I’m going to use Mac OS Extended Journaled (JHFS+) as the system format type and name it “Empty”. The syntax is going to look like this: Diskutil eraseDisk JHFS+ Empty /dev/disk5s2
It’s important to keep in mind that if you run the eraseDisk command, the target disk is going to lose all its data, so make sure you are erasing the proper disk.
If you need different system format types, here are a few references you could use instead of JHFS+:
- Mac OS Extended: HFS+
- MS-DOS fat32: FAT32
- ExFAT: ExFAT
Disk Utility User Guide
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In Disk Utility on Mac, you can erase and reformat storage devices to use with your Mac. Apple imac downloads. Erasing a storage device deletes everything on it.
- If you have any files you want to save, copy them to another storage device.
- Open the Disk Utility app on your Mac using one of the following methods, depending on the type of disk or volume you want to erase:
- If you want to erase your startup disk or startup volume: Start up from macOS Recovery, then choose Disk Utility from the macOS Utilities window.
- If you want to erase any other type of disk or volume: Double-click Disk Utility in the /Applications/Utilities folder.
- Choose View > Show All Devices.
- In the sidebar, select the storage device you want to erase, then click the Erase button .
- Click the Scheme pop-up menu, then choose GUID Partition Map.
- Click the Format pop-up menu, then choose a choose a file system format.
- Enter a name.
- (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK.Secure erase options are available only for some types of storage devices. If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device.Writing over the data three times meets the U.S. Department of Energy standard for securely erasing magnetic media. Writing over the data seven times meets the U.S. Department of Defense 5220-22-M standard.
- Click Erase, then click Done.
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Note: With a solid-state drive (SSD), secure erase options are not available in Disk Utility. For more security, consider turning on FileVault encryption when you start using your SSD drive.
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See alsoApple Support article: How to erase a disk for MacPartition a physical disk in Disk Utility on MacFile system formats available in Disk Utility on MacFormat a disk for Windows computers in Disk Utility on MacEncrypt and protect a storage device with a password in Disk Utility on Mac