The steps we must follow to recover Mac data that has been corrupted or deleted are remarkably similar to those used to rescue lost Windows files. When we accidentally delete a file on our Mac computer we must have a program designed to recover Mac files. Of course the Mac file structure and Windows files are very different. This is especially true in regards to files used to access hard drive storage.
A program to recover Mac files must be able to recognize both proprietary Mac binary code as well as common cross OS file types. The similarity remains in that one must open the hard drive and copy out from it all files before reloading the operating system. If this is not done the drive will be reformatted and recovery will be far more difficult. The best software to recover Mac files will be able to immediately open and scan a crashed Mac drive.