Imagine how difficult it would be to access files on your computer if you stood on one side of a brick wall and your computer was placed on the other. This is essentially when you’re facing when you attempt to access files on a failed Mac Computer hard drive. And, as in the brick wall analogy, you must get past barriers set up by the Mac OS X operating system in order to successfully recover Mac Data.
The Mac OS X system must verify the successful operation of the computer’s hard disk drive before it will allow access. This means that should any sector of that drive have failed, access beyond that point is denied. This process is known as disk verification. Quality programs for Mac partition recovery enable you to leapfrog over the wall or barrier of disk verification and immediately access any stored files on your Mac computer. For this reason one must never attempt file recovery on a Mac using a Windows based data recovery tool despite claims by software makers, as it is an impossibility for the program to successfully recover lost Mac files.