In all of computing there is nothing like that feeling you get when you realize you just lost that file that contains hours and hours of work. Even worse seeing that flashing question mark and wondering if behind it lies an empty wasteland that was once your hard drive full of data. If data corruption is a predator lurking in the darkness waiting for an opening to steal your most precious files, disk utilities are our knights in shining armor waiting our beacon call to guarantee the security of our data. This MacTip discusses Macintosh disk utilities, how to use them and how to avoid some of the trouble you can get into using them. What they do.
All disk utilities function on the same premise.
There are two conditions it concerns itself with, what your drive looks like, and what a healthy drive looks like. A healthy drive has certain factors that are true when it is operating properly. Each disk on your machine regardless of size will always have specific elements that make it function properly. At the beginning of each disk will be information that tells your computer how to make it show up on the desktop of your machine. There will also be information containing the name of the disk, in what format the data is stored, the location and size of the files on the disk, etc.