Disk Copy was the default utility for handling logical volume images in System 7 through Mac OS X 10.2. In later versions of macOS it has been replaced by DiskImageMounter for mounting the images and Disk Utility for creating them.From Wikipedia: Disk Copy (CC BY-SA 4.0)

Disk Copy was the default utility for handling logical volume images in System 7 through Mac OS X 10.2. In later versions of macOS it has been replaced by DiskImageMounter for mounting the images and Disk Utility for creating them.From Wikipedia: Disk Copy (CC BY-SA 4.0)