If you don't want any changes made to the files in the folder at all, or new files to be added, select Read-Only. Under the Image Format dropdown box, select Read/Write to be able to change files held within the image once it is created. As indicated in the dropdown box, selecting 256-bit is more secure but will be slower to access than 128-bit. Under Encryption, select either 128-bit or 256-bit AES encryption. ![]() At the top, you can change the name of the disk image to something more appropriate to its contents instead of using the folder name by default, and where you want it to be initially saved. In the dialog box, select the folder you wish to protect, and click Open.Ī new dialog box will appear with a number of options available for creating the disk image. In the Disk Utility menu, select File, New Image, then Image from Folder., or use the keyboard shortcut Shift-Command-N. Alternately, use Spotlight to search for Disk Utility. Open up Disk Utility, which can be found in the Applications folder, under Utilities.
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