To create an image backup of an external disk drive using the OS X Disk Utility found in the Applications/Utilities folder, take the following steps after attaching the drive to the Apple computer.
- Open Disk Utility, from the Applications/Utilities directory.
- Click on the external disk drive in the left pane of the utility to select it.
- Click on File, then select New and Disk Image from, e.g. Disk Image from "TOSHIBA EXT" for an external Toshiba USB drive.
- You will then be prompted to give the image a name and can select the directory where you wish it to be stored. You can also select whether the image will be compressed and whether it will be encrypted.
- Click on Save to initiate the creation of the disk image. When prompted that "diskimages-helper wants to make changes. Type your password to allow this.", provide a password for an account with administrator privileges on the system. When the image has been created, you will see it listed in the left pane of the Disk Utility window.
You can then use the OS X Finder program to view the files stored in the Apple Disk Image DMG file that was created by double-clicking on the .dmg file that was created.
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