• How to Format an External Drive for Mac Compatibility!
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  • How to erase a disk!

The process of formatting the drive will erase all data currently stored on the device. Make sure you have a current backup if you intend to keep any data already present on the drive. The process of formatting a drive is often confused with erasing a volume.

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The difference is that formatting affects an entire drive, including any volumes and partitions that have been created on it, while erasing a volume affects just that volume, and doesn't destroy partition information. That being said, the version of Disk Utility included with OS X El Capitan and later actually doesn't use the word format; instead, it refers to both the formatting of a drive and the erasing of a volume with the same name: So, while we're going to be formatting a drive, we'll use Disk Utility's Erase command.


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That's all there is to the basics of formatting a drive using Disk Utility. Remember, the process outlined here creates a single volume using all available space on the selected drive. Also be aware that the Format and Scheme types listed in the Erase option of Disk Utility will have changes as time goes on.

How to erase a disk for Mac

Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. 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.

Disk Utility for macOS Sierra: Erase a volume using Disk Utility

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.

How to Format External Hard Drive on Mac

Which format: Identify the current format If you want to know which format is currently in use, use any of these methods: Select the volume in the Disk Utility sidebar, then check the information on the right. Nytro Leverage flash storage. Exos Achieve greater capacity.

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Disk Utility for macOS Sierra: Erase a volume using Disk Utility

Instructions for installing an internal drive as a bootable or a storage drive in MacOS X. Physically install the drive into the Mac. Power on the computer while holding down the option key.


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Select Installer.