This command lets you get information about a disk image, such as its format, information about its partitions, how much data it contains, and the effectiveness of the compression.
You can hold down the Command or Shift key to get information about multiple disk images at once. The Enter Passphrase… button lets you specify the passphrase for reading an encrypted disk image. The From Configuration pop-down menu lets you use a passphrase that’s stored in your keychain as part of a configuration.