Hfs+ Partition Corruption Error: bad Super Block: Magic Number Wrong

Most of the Mac-formatted hard drives are shipped either with the Power PC compatible

Apple Partition Map or with the GUID Partition Table scheme, while the PC-formatted hard disks use MBR scheme. The latter generally come with FAT file system. Thus, when you run fsck in order to check or fix a corrupted Mac OS X partition, it reports errors.

The reason is that it expects a Unix file system with a unique identifier called magic number and not FAT. When it cannot find the expected magic number, it declares that the corrupted partition cannot be repaired. As a result, you need to opt for more effective mac file recovery solutions.

Mac OS X users often complain that fsck has been unable to repair their corrupted partition with magic number errors. Suppose a Mac OS X user installs Boot Camp to benefit from its usability. Later, he/she finds that one of the OS X partition cannot be detected under the operating system. Expecting it as the case of partition corruption, he/she runs fsck. But contrary to the belief, fsck fails to repair the partition and gives the below error message:

BAD SUPER BLOCK: MAGIC NUMBER WRONG

As a consequence of this behavior, the corrupted partition cannot be fixed and data remains inaccessible.

Solution

As explained above, the above error might result when fsck cannot find the expected magic number. Thus, you need to partition and reformat the Mac hard drive to a partition scheme that fsck can understand. To do so, click Partition tab in Disk Utility, select the affected partition in Volume Scheme drop-down menu, click Options, and select the GUID Partition Table scheme. Make sure to select Mac OS Extended option from Format drop-down menu and click Apply.

After the partition has been reformatted, you need to restore lost data from last available backup. In case, no suitable backup is present, the only solution to recover it is to use a Mac Data Recovery utility. Mac Recovery software are specifically programmed to scan a crashed Mac disk and retrieve inaccessible lost files and folders from it.

Stellar Phoenix Macintosh Data Recovery is a high-end utility that can recover lost data from Mac formatted disks using HFS, HFSX, HFS+, HFS Wrapper, and FAT file systems. This is an easy-to-use File recovery mac utility that is compatible with Mac OS X 10.6.x, 10.5.x, 10.4.x, and 10.3.9.

by: Allen Sood

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