Disk Utility is Apple's tool for managing disks and disk images in OS X. One component of this program's image handling features is the ability to compute a checksum to verify the image's integrity. Sometimes when you download a disk image from a Web site, the site will mention a checksum for the image that you can compare to a locally computed checksum. If these do not match, then chances are the file was altered from the intended version supplied on the site.
There are a number of checksumming routines commonly used for providing integrity checks for … Read more