A Disk Utility window with Show Only Volumes view selected. The sidebar on the left displays two internal volumes, one external volume, and one disk image volume. The right side of the window shows details about the selected volume.

Let macOS manage space between multiple volumes

With Apple File System (APFS), the file system introduced in macOS 10.13, you can easily add and delete volumes on your storage devices. APFS-formatted volumes automatically grow and shrink—you never have to repartition a storage device again.

How to add a volume to an APFS container

A Disk Utility window showing the erase dialog being set up to reformat an external drive with an APFS encrypted format.

Keep your external storage devices secure

When you get a new flash drive or other storage device, format it as APFS and encrypt it with a password to protect its contents.

How to protect a storage device with a password

A Disk Utility window showing the First Aid confirmation dialog.

Give your disk a checkup

If you’re having problems with a disk, Disk Utility can check the disk and repair problems it detects.

How to repair a disk

To explore the Disk Utility User Guide, click Table of Contents at the top of the page, or enter a word or phrase in the search field.

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