In Disk Utility on Mac, you can erase and reformat storage devices to use with your Mac. 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: What software do i need to 3d print.
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.
Apple wireless keyboard with touch bar. 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. Apple spreadsheets free download.
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. Abbyy finereader pro 12 1 4 download free.
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. Permute 3 1 9 esv.
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.
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.
Apr 13, 2015 Trying to erase my hard drive and it won’t unmount: Disk erase failed. Couldn’t ummount disk. The diskutil list command brought up just /dev/disk0 (plus disk0s1, disk0s2 and disk0s3). The command “sudo diskutil unmountDisk force /devdisk0” failed because “at least one volume could not be unmounted.”. If you want to try and identify which application is using the troublesome file, you could try the following Terminal Command: Click on the Trash so that a Finder window opens up. Now open Terminal and type lsof (followed by a space). Don’t press return. Drag the file that’s in use from the Trash to.