How to Create a Disk Image From a Folder on a Macintosh


A disk image file on a Macintosh computer is also known as a DMG file, or Mac OS X Disk Image.(ref 1) Once Mac OS X launched, the DMG file replaced the IMG file of older Macintosh operating systems. (ref 1) Disk image files mount virtual disks on your Macintosh computer that look and act like external disks. (ref 1) They contain files and can be copied or ejected, just like a DVD or CD. You can create a disk image from a folder on a Macintosh computer simply by using the Disk Utility application that comes pre-installed on all modern Macs.

Things You'll Need

  • Mac OS X 10.3 or later
  • Open Disk Utility in your Hard drive/Applications/Utilities folder. (ref 2)

  • Select ‘New’ from the File menu. Select ‘Disk Image from Folder.’ A new window will open. (reference 2)

  • Choose the folder you would like to turn into a disk image on your Macintosh computer. Click ‘Image.’ (reference 2)

  • Select a location for the disk image to be created. (reference 2)

  • Choose the type of file you would like to create in the ‘Image Format’ menu. (reference 2)

  • Choose the level of security from the ‘Encryption’ menu. (reference 2)

  • Click ‘Save.’ A new disk image file will mount on your computer. The disk image has been created from a folder on your Macintosh.

Tips & Warnings

  • If you choose to encrypt your disk image file you will have to choose a password in order to protect it. (reference 2)
  • When Disk Utility creates a disk image out of a folder it leaves the original folder intact.
  • If you do not remember the password to an encrypted disk image folder you will not be able to access that folder again.

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  • Photo Credit Sean Gallup/Getty Images News/Getty Images
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