The HFS (Hierarchical File System) is the most important component of Mac OS X computer. It provides high stability, data availability and access speed. This file system is made of various components and these components perform given task. These components are useful in improving the speed to your system. But in some situations, damage to these components might damage entire file system and cause serious data loss situations. In order to sort out the issue, you are required to use Mac Data Recovery solutions to get your mission critical data back.
The HFS file system divides a hard drive volume into the logical blocks of 512 bytes. These blocks are then grouped together in allocation blocks that can store one or more logical data block, depending upon the total size of volume. The HFS file system employs a 16-bit value to address the allocation blocks, by limiting the number of allocation blocks to 65,536.
The HFS file system is made up of five data structures:
1. The logical blocks 0 nd 1 of Mac volume are Boot Blocks that store system startup information.
2. Logical block 2 store MDB (Master Directory Block). It defines various kinds of data about volume itself.
3. The logical block 3 is starting block of Volume Bitmap. It keeps track of which allocation block is free and which is in use.
The Extent Overflow File is the B-tree, which stores extra extents that record which allocation block is allocated to which file, once the first three extents in Catalog File are used up.
Catalogue File is another B-tree, which contains records for all files and directories stored in volume. Catalogue File stores four types of records. Every file has a File Record and File Thread Record while every directory has a Directory Record and Directory Thread Record.
Among all the file system components, the Catalogue File is the most important one. It stores all the file and directory records in single data structure that might create performance issues in case of multitasking. This is also risky as damage to catalog file can damage the whole file system and cause data loss issues. At this point, Mac Recovery is the only thing that can help you to recover your data.
This is best possible with the help of Mac Data Recovery software. These are third party applications, which use advanced scanning algorithms to scan the drive, locate the lost data and recover it. These software are completely easy and safe to use.
Data Recovery Lab technicians are trained to retrieve lost data in 96% of data loss case in HFS file system. We are able to recover data from all HFS, HFS+, HFSX, HFS Wrapper and FAT file system volumes. Data Recovery Lab specialises in Mac data recovery.