Microsoft Windows stores files in hard drives and other digital media using the NTFS System. Linux based computers use what is known as the Super Block system. And Mac OS X computers use HFS. Each of these is simply a directory and cataloging method that the operating system of each can use to recognize both file types and locations of that file. And while the Windows system is fairly straightforward, as it divides file locations into sectors and grants needed access to those sectors, Mac OS X sets a few roadblocks.
These barriers come in the way of the disk initialization and disk verification process. Mac computers will not allow access to stored files if sector damage exists at any point in the path of access. And while the Mac OS will repair these difficulties, that repair often results in loss of files. To recover Mac files either accidentally deleted or lost due to corruption and subsequent repair you must have a program that can work past this recognition problem and recover Mac files.