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Disk Utility 12.x: Disk image formats

Disk image formats

When you create a disk image, you can choose the best format for how you’ll use the image. Here are the most common disk image formats:

Image Format Description

read/write

Choose this if you want to continue adding files to the disk image after it’s created.

sparse bundle disk image

Choose this if you want to continue adding files to the image and want to conserve space. The disk image is just large enough to hold the files in it and expands to its maximum size as you add files to it. For example, if you create a 100 MB sparse bundle disk image, its maximum size is 100 MB. (This format replaces sparse disk image.)

read-only

Choose this If you don’t need to add more files to the disk image.

compressed

Choose this if you don’t need to add more files to the image and want to conserve space. The data is compressed, so the disk image is smaller than the original data.

CD/DVD master

Choose this if you want to use the disk image with a third-party application. The disk image contains a copy of all sectors of the disk, whether they’re used or not, and copies them to other CDs or DVDs exactly as they’re stored in the disk image.

Last Modified: Jul 11, 2012
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  • Last Modified: Jul 11, 2012
  • Article: PH5866
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