Mac OS X file systems are considered comparatively more secure from corruption point of view. This is owing to a host of crash recovery features like, file system journaling, However, there still exist some situations that can corrupt Mac OS X volumes. These volumes comprise of metadata structures like, MDB (Master Directory Block), catalog file, etc. that might corrupt the volume and render it inaccessible for Mac OS X user. Most of these corruptions can be detected and repaired by built-in utility called ‘Disk Utility’. But if the problem remains unresolved, you should delete the corrupted volume, provided, a good backup of required data is available. But if such a backup does not exist, run a Mac Data Recovery software and extract all possible data.
‘Disk Utility’ fails to repair the corrupted volume in many instances. To support the fact, let’s consider a realistic situation, wherein, a Mac OS X user tries to mount a volume that has been named as ‘Volume1′. This volume contains important files and folders, but, when an attempt is made to mount it, it cannot be mounted. Running ‘Disk Utility’ on this volume shows the below error messages:
Verifying volume “Volume1”
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Invalid map node
Checking Catalog file.
Invalid sibling link
Volume check failed.
Error: Filesystem verify or repair failed.
This error by ‘Disk Utility’ indicates that the volume is corrupted - The file system of volume is corrupted. Such errors won’t allow you to access the files and folders stored in the affected volume.
How to Solve?
Issues, which cannot be fixed by ‘Disk Utility’ should be resolved by running fsck manually. To do so, boot the computer in a single-user mode and while the computer is booting, press ‘command’ and S keys down. Next, you need to type fsck -fy command.
If the issue continues, you can delete the volume and restore data from backup. However, to extract data from corrupted volume, you need a Mac File Recovery solution. Mac Data Recovery software are easy-to-use and can scan a corrupted Mac volume to recover all lost data.
Stellar Phoenix Macintosh Data Recovery is a powerful utility that recovers lost or inaccessible data from disks running on Mac OS X 10.6.x Snow Leopard, 10.5.x Leopard, 10.4.x Tiger and 10.3.9 Panther computers. It is a simple Mac File Recovery utility that supports HFS, HFSX, HFS+, HFS Wrapper file systems.
Resolving ‘ Filesystem verify or repair failed’ Er