In a computer system, hard drive stores all of your mission-critical data, operating system and applications. The hard drive is very prone to failure and may encounter a number of problems that lead to data loss. No matter what hardware and software you are using, the system crash and data loss may occur at any point. To handle minor hard drive and file system corruption like situations, operating systems offer in-built disk repair utility. For example, Mac OS X offers Disk Utility and fsck command-line tool to sort out these problems and prevent need of Mac Data Recovery in worst case scenarios.

Both of these utilities in Mac OS X work in majority of cases of hard drive failures and could easily detect the errors and could fix the minor issues. In some cases, these tools might report you below error while carrying out the checking of hard drive and fixing detected problems:

“Overlapped extent allocation.”

Above error message is reported by Mac OS X, when disk repair tools are unable to fix the errors that they found.

In Mac OS X, the Overlapped Extent Allocation error indicates that two files are occupying the same memory space on the hard disk. Though, such problem occurs so rarely but they cause data loss whenever they take place. When these errors occur, you should not install a new software of affected drive.

At this point, you can not access your valuable data from the hard drive and thus come across data loss situations. To recover data in these cases, you need to go for Mac File Recovery by sorting it out.

Resolution

In order to sort out this issue, backup your data and then carry out 'Erase and Install' installation of your Mac OS X system by using Installation DVD. It resolves most of the disk related problems and make your system usable. But this is not an ideal solution as it removes all of the data from hard drive.

In these critical situations, Mac Recovery Software come for your help. They use high-end scanning techniques to perform in-depth scan of your hard drive and retrieve all of the lost data from it. The Mac Recovery applications allow you to carry out recovery on your own as they have interactive and simple graphical user interface.

Stellar Phoenix Macintosh Data Recovery is the most advanced and powerful tool for efficient recovery in most of the data loss situations. It recovers data from all HFS, HFS+, HFSX, HFS Wrapper and FAT file system volumes. The software works well with Mac OS X 10.6, 10.5, 10.4 and 10.3.9.