Disk Utility 12.x: Convert a disk image
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You can use Disk Utility to convert the image format and encryption of a disk image.
For example, if you create a read/write disk image but later want to prevent changes to the image, you can convert it to one of the read-only disk image formats.
- Open Disk Utility, in the Utilities folder in Launchpad.
- Select the disk image if it appears in the list at the left, and then choose Images > Convert.
Otherwise, choose Images > Convert, and then select a disk image in the dialog that appears.
- Choose a new image format or encryption option.
- Type a new name for the image, and then click Save.
You can also change the format of a read/write disk image by erasing it. When you create a disk image, its format is Mac OS Extended (Journaled). When you erase a disk image, you can change it to another format, such as MS-DOS. Erasing a disk image deletes all the files it contains.
Last Modified: Sep 3, 2015