HFS File System Damage and Mac Data Recovery

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.


What is Data Recovery?

Data recovery is a highly technical, highly labor-intensive process used to restore lost files from a variety of digital storage media and devices. The process is carried out in a controlled environment using Class 100 clean rooms and Class 10 horizontal flow clean benches to protect client media and all recovery equipment from contamination. (All Data Recovery Lab clean room facilities undergo annual certification testing to ensure that they meet or exceed acceptable air flow uniformity and particle count standards.)

Storage systems can fail in many different ways, however the data stored on them is not always completely lost. The specific technique used to recover the information depends on the type of failure (file corruption, virus attack, mechanical or electrical problem, and human error). Sometimes these problems occur in combination. Data Recovery Lab full-service lab facilities are prepared to address all failure modes using the industry’s most advanced recovery technology and procedures.

How can I prevent further loss of data?

To avoid further damage to your media and prevent extended data loss:

a. Do not perform any operation on the storage device that will cause physical damage to the device or the data on it

b. Do not write to any of the files on the device or add additional files

c. Do not format the drive

e. Do not modify the partitions on the drive (using FDISK or any other partitioning software)

f. Do not try to open the device to see what is wrong. (Hard drives are particularly sensitive to contamination and should only be opened in a microscopically clean environment)

g. Stop using the hard drive or storage device that requires recovery. If your drive is making unusual noises or showing other obvious signs of distress, shut it down immediately and do not power it up again. Before you forget them, write down all symptoms of the failure and all recent actions and events involving your computer. Contact Data Recovery Lab for additional advice.

h. If you seek help from a trusted local computer specialist, please remember that professional data recovery is a skill learned from practice and requires highly specialised tools and they will almost certainly refer you to a data recovery company such as Data Recovery Lab.

NOTE: While data recovery can seem expensive due to its a highly technical and labour intensive process, recreating your data may be significantly more expensive. Also, the turnaround time for data recovery is usually much faster than the time it would take to recreate your lost files from scratch. If lost data are images or databases, you may not even be able to reproduce them at all.