Working with Disks - Teach Yourself Visually Complete Mac Pro - page 741

A Disk Utility opens a Finder window to show the contents of the disk image.
B The disk image appears in the Disk Utility window.
C This item represents the contents of the disk image.
Note: It might take a minute or two for the disk image to open, depending on its size.
TIPS
How do I unmount a disk image's contents?
It is a good idea to unmount the contents of a disk image to avoid making accidental
changes. In Disk Utility, click the contents of the disk image and then click Unmount . To
hide the disk image contents, click the disk image and then click Eject .
Why does the disk image still appear in Disk Utility after I have ejected
it?
Disk Utility assumes you will want to reopen the disk image in the future. Instead of doing
this by repeating steps 4 to 8 , you can simply click the disk image and then click Open . If