Oct
31
2011

Apple OS X Recovery for Corrupted HFS File System Volumes in Mac

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HFS (hierarchical File System) is a popular and powerful file system, originally developed for hard drives and floppy disks on Mac OS X computer. It is the predecessor of HFS+ (Mac OS Extended or HFS Extended) file system. Though, it is not used as a standard file system for earlier versions of Mac OS X operating systems, it is still used on hard drives, optical disks and removable storage media-supported by Mac OS X operating system. In some situations, the HFS file system volume may become inaccessible on Mac OS X operating system-based computers and can result to critical data loss situations. At this point, Apple OS X recovery becomes the need of the hour in the pursuit of recovering your valuable data.

HFS file system divides your total volume space into several equal-sized pieces, known as allocation blocks. The file system employs 16-bit fields for identifying particular allocation blocks and thus the number of allocation blocks must be less than 65,536. A non-empty fork should occupy an inherent number of allocation blocks. As the size of volume and number of allocation blocks increases, amount of the allocated but unused disk space likewise increases.

Allocation block is the smallest unit of disk space that is allocated to any file. The “allocated” and “free for writing” allocation blocks are tracked by the Block Allocation Map. In order to improve the system performance, HFS file system replaced flat table structure with Catalog File that uses B-tree structure, which can be searched pretty quickly, regardless of the size.

All the data structures, which are used by HFS file system to store, manage, access and manipulate data are very critical for the work flow of the file system. If any of these metadata structures get damaged or deleted, file system may not work properly and data loss situations occur that require Apple Recovery solutions. Data structure can be the outcome of numerous reasons, including virus infection, improper system shutdown, user errors, system crash and operating system malfunction. At this point File recovery Mac applications are essential to salvage business-critical data.

The Mac recovery software are specifically designed to thoroughly scan the problem storage media using advanced scanning algorithms and extract all lost data. They offer secure and simple recovery with read-only conduct and rich graphical user interface.

Tip! Use the best software which is the most efficient in ensuring absolute recovery of lost data in all possible scenarios. This software must recover lost Mac data from HFS, HFS+, HFSX, HFS Wrapper and FAT file system volumes.

By: Max Delton