Then restart your Mac and try again. You can erase a disk or a volume on that disk at any time, including in circumstances such as these:. Are you formatting the disk that came built into your Mac?
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Are you about to install macOS High Sierra or later on the disk? If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended Journaled. Are you preparing a Time Machine backup disk or bootable installer? Will you be using the disk with another Mac? Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. How to erase a disk for Mac Use Disk Utility to erase format a hard disk, flash drive, or other storage device for Mac.
How to erase a disk Disk Utility can erase disks, add volumes, check disks for errors, and more.
How to erase a disk for Mac
You can also find it in the Utilities folder of your Applications folder. From the sidebar in Disk Utility, select the disk or volume to erase. Click the Erase button or tab, then complete these fields: Enter a name for the disk or volume, such as "Macintosh HD". Disk Utility shows a compatible format by default.
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Click Erase to begin erasing. Quit Disk Utility when done. Why to erase a disk You can erase a disk or a volume on that disk at any time, including in circumstances such as these: Mac OS Extended Journaled: Uses the Mac format, requires a password, and encrypts the partition.
Uses the Mac format and is case sensitive to folder names. Uses the Mac format, is case sensitive to folder names, requires a password, and encrypts the partition. To prevent the erased files from being recovered, click Security Options, use the slider to choose how many times to write over the erased data, then click OK.
Writing over the data three times meets the U. Department of Energy standard for securely erasing magnetic media. Writing over the data seven times meets the U. Department of Defense M standard.
Disk Utility erases, formats, repairs, and partition hard drives and SSDs
Disk Utility for macOS Sierra: Erase a volume using Disk Utility. Click the Format pop-up menu, then choose a volume format. Use for Windows volumes that are 32 GB or less.
Use for Windows volumes that are over 32 GB.