Disk Utility 12.x: Duplicate a disk, CD, or DVD

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Duplicate a disk, CD, or DVD using Disk Utility

You can duplicate one disk onto another. For example, you can duplicate your startup disk to use as a backup.

Duplicate a disk

  1. Open Disk Utility, in the Utilities folder in Launchpad.
  2. Select the disk you want to duplicate, and then click Restore.
  3. Drag the disk you want to duplicate to the Source field.

    You can drag it from the list at the left or from the Finder.

  4. Drag the disk that will contain the copy to the Destination field.

    If you can’t drag a particular disk to that field, you can’t copy to it. If it’s your startup disk, start up your computer with another disk, such as a Mac OS X installation disc. Otherwise, try to quit any applications that are on it or that use documents on that disk.

  5. If you want to erase the destination disk before copying to it or use the copy as a startup disk, select “Erase destination.”

    If you don’t want to erase the destination disk, deselect “Erase destination.”

  6. Click the Restore button.

Duplicate a CD-RW or DVD-RW

Disk Utility can’t create usable copies of discs with an incompatible format or discs that are copy-protected. (These include most commercial movie DVDs and audio CDs and some software and data discs.) To copy music from an audio CD to another CD, use iTunes, not Disk Utility.

To burn a disc, you need an optical drive in your computer or connected directly to your computer. You can’t burn a disc using a remote optical drive.

  1. Open Disk Utility, in the Utilities folder in Launchpad.
  2. Insert the CD or DVD disc in the optical drive, and select it in the list at the left.
  3. Choose File > New > “Disk Image from [disc name].”
  4. Type a name for the disk image.
  5. Choose an option from the Image Format pop-up menu.
    • Choose “compressed” to create a smaller disk image.

    • Choose “read-only” to create a disk image that’s quicker to create and open.

  6. Click Save.
  7. After Disk Utility creates the disk image, eject the original CD or DVD.
  8. Select the disk image in the list at the left, and choose Images > Burn.
  9. When the Burn Disc dialog appears, insert a blank CD or DVD, and then click Burn.

You can continue using the disk image to create as many duplicate discs as you need.

Published Date: Jun 1, 2018