However, these options are hidden in Disk Utility by default. This is fine, but often developers (including Apple) will issue updates and other software in disk images and include an SHA or MD5 checksum that you can use to verify the image’s integrity before opening it. This is usually done when the image is opened, but you can also do it manually by adding an image to Disk Utility, selecting it, and choosing Images > Checksum > CRC-32 image checksum. If you have an image, especially an older one, you might wish to verify its integrity before opening it. The first of these is the hidden checksumming routines for verifying disk image files. Use a Terminal command to expand Disk Utility’s checksum options. While these features are relatively apparent, the program does have some often overlooked options that can be useful. One of OS X’s most versatile utilities is Disk Utility-a tool not only used for formatting and managing a variety of storage devices, but also employed for fixing damaged volumes and performing the ever-so-common “permissions fix” routine.
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