Are you trying to fix Mac OS X file system corruption ? Mac OS X uses hfs+ partition to get installed in the Mac hard drive. You can create different partitions using the inbuilt disk utility. But sometimes the file system gets corrupted and you will not be able to access the files stored in that partition. If the corruption occurs in the startup disk where the operating system is installed then you won't be able to boot in to the system and it will be necessary to fix Mac OS X file system corruption. The corruption can be caused if the system is abruptly closed, partition process goes wrong, hard drive error or is infected by virus. Some of the minor corruption issues can be fixed by disk utility but if the problem is major then you have to format the drive and install the Mac OS X again. The lost data can be recovered with the help of time machine but if it does not work then try Mac data recovery software. It has the capability of complete recovery of every type of file. So first you fix Mac OS X file system corruption and then use the software for easy recovery of lost files.