Importance Of Data Recovery And The Techniques Used The modern world is ruled by electronics with business and communication conducted using the internet, digital equipment and software. Computers have emerged as one of the biggest contributions technology has made in recent times and it is rare to find a society that doesn't rely on them. But with all that computers have to offer us in terms of efficiency, they do have a few snags. Data loss is the biggest, resulting from a failed operating system, physical damage, corruption or malware.
The loss of data can cost a company millions in liabilities. Imagine losing access to client information, company files and sensitive data. You can and will be sued for all you have; which is why so much stock is put into data recovery.
Data recovery is the process of retrieving data lost due to corruption, damage or failed systems. Most data is saved in storage media like hard disks (external and internal), CDs, DVDs, USBs and tapes. The damage is either physical or logical, the latter of which results from an operating system not being able to mount the medium in order to access the stored files.
Recovering lost data is expensive especially when the damage is severe. But leaving it lost costs even more so it's crucial that data recovery experts are called in to help. They will not only recover missing data - as much as is possible since some files may not be salvageable - but will also educate people on how to backup data properly.
The methods used to recover data depend on the type of damage the medium has sustained (physical or logical). Owing to the potential difficulty and high cost of successfully recovering lost files, end users are urged to backup data in the event that something goes wrong with storage media and computer systems.
Physical damage can be a result of cracks, breaks, fire, power surge or failed motors. Unless one has the technical expertise or the necessary tools to fix the problem, professionals need to be hired. Damaged parts of the disk may be repaired or replaced to make the medium usable. However, since there will likely be logical damage as well, technicians will use a disk-imaging procedure to recover readable bits from the surface. The recovered parts are then stored on another medium and analyzed to see how much of the lost data can be reconstructed.
Other techniques used for physically damaged media involve placing hard disk platters into healthy drives, reassembling disk heads and performing what's known as a http://bloggers.nl/chinapcb/ printed circuit board (PCB) swap wherein the damaged PCB is replaced with a new one and read from the donor drive before being transferred again to the target drive.
Logical damage involves software-related issues as opposed to physical or hardware damage. Here, specialized software is used to recover lost files. However, it's important to note that some techniques can be applied by end users having little knowledge of data recovery and it's only when the damage is extensive that experts are called.
Techniques to repair logical damage involve an attempt to recover filesystems using recovery software, running a consistency check and rebuilding filesystems from scratch, the last of which requires a lot of expertise. Data carving, for instance, is a method that attempts to reassemble files from fragments if no metadata is present. Knowledge of file structures and heuristics is needed to figure out which fragments belong together. It takes time and the use of special software to ensure that the results are accurate.