How to reformat mac disk utility

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.

Format an External Hard Drive or USB Flash Drive for Mac OS X

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 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.

Format a Mac's Drive With Disk Utility (OS X or Later)

Use for Windows volumes that are over 32 GB. Enter a name for the disk or volume. 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.

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• Why to erase a disk?

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.

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.

Format a Mac's Drive Using Disk Utility (OS X El Capitan or Later)

The File System column on the right shows the format of each volume. The Get Info window shows the Format of that volume.

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