The Fastest option does not securely erase the files on the disk, meaning a disk-recovery app may be able to recover them. The next option writes a pass of random data and then a single pass of zeros over the entire disk while erasing all information used to access your files. As mentioned, erasing the disk reformats it completely.
Why to erase a disk
Got stuck? How to erase and format external disks on your Mac Christian Zibreg on May 24, 0.
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- Disk Utility erases, formats, repairs, and partition hard drives and SSDs.
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Disk Utility lets you erase disks or volumes. Depending on the type of your disk, some options may not be displayed here.
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The following partition schemes are at your disposal: 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.
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How to erase a disk Disk Utility can erase disks, add volumes, check disks for errors, and more. You can also find it in the Utilities folder of your Applications folder.
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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. Click Erase to begin erasing. Quit Disk Utility when done.
Erase a volume using Disk Utility on Mac
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: You received a message that your disk isn't readable by this computer. The macOS installer doesn't see your disk or can't install on it. For example, the installer might say that your disk isn't formatted correctly, isn't using a GUID partition scheme, contains a newer version of the operating system, or can't be used to start up your computer.