Computer Data Recovery

The process of recovering lost data from a corrupted, inaccessible, failed or damaged secondary storage media is referred to as data recovery. The purpose of data recovery is to recover the damaged or lost data by accessing the damaged or failed storage media. The data are often salvaged from such storage media formats as storage tapes, hard disk drives, RAID, DVDs, CDs and many other electronics by means of several recovering techniques in the process of data recovery. Data recovery includes recovery of the storage device from physical damage and recovery of the file system from logical damage to the data. Data recovery also refers to the process of retrieving as well as securing the information deleted from a storage media. The use of data recovery in this case is for spying or forensic purposes. Multiple recovering techniques have technically been developed and advanced for hard drive recovery, recovering lost data and repair of hard disk crash.

Different Forms of Physical Damage

Failures that subject storage media to physical damage vary widely. Dye layer or metallic substrate of CD-ROMs may suffer scratches. Failed motors and head crashes are mechanical failures that hard disks may experience. Tapes may simply break. Any sort of physical damage results at least in some data loss. It many a time harms the logical structures of the file system as well. This sort of physical damage is better referred to as logical damage. It should be dealt with before the recovery of any files from the failed media.    

Recovery Techniques

Multiple recovering techniques are there for recovering lost data from the physically damaged hardware. Replacement of some damaged parts in the hard disk is one of the recovery techniques to repair some sorts of physical damage. Though the disk becomes useable after its treatment with this recovery technique, some logical damage may still be there. A specialized disk-imaging procedure is reliable as one of the recovery techniques for recovering lost data from the surface. Analysis of the image for logical damage is safely done after acquiring and saving it on a reliable medium. It possibly allows reconstruction of much of the original file system.    

Hardware Repair

Recovering techniques for hardware repair through technical treatment of physical damage are multifold. These techniques work for hard drive recovery. Hard drive recovery can easily be accomplished with removal of a damaged printed circuit board or PCB and replacement of it from the drive with a similar PCB. It often entails a microchip moving to the replacement from the original board. Using matching parts of a healthy drive to change the damaged read and write head assembly is another procedure for hard drive recovery. Installation of the hard disk platters into a healthy drive after removing them from the damaged drive is no less effective than other recovery techniques for hard drive recovery. Often all these procedures work in a combination for hard drive recovery. The nature of all these recovery techniques is highly technical.

Disk Imaging

The usable data is constructed using the extracted raw image after the repair of any logical damage. The files return to its usable form despite incomplete recovery, once the reconstruction is complete.  

Open source tools like DCFLdd v1.3.4-1 can be used for recovering lost data from all save the physically damaged sectors. The study conducted by a Defense Cyber Crime shows that the DCFLdd v1.3.4-1 produces more bad sectors when installed on a Linux 2.4 Kernel system. It rather results in the loss of information. The study also shows that the DCFLdd v1.3.4-1 leads to the loss of only bad sectors when it is installed on a FreeBSD Kernel system. ILook IXImager is another tool to image the damaged media correctly.

Hard Disk Drive data recovery imaging is a technically high-end tool to repair the hard disk crash for recovering lost data. It works by means of highly technical recovering techniques. This data recovery imaging system has some exclusive features. It efficiently communicates with the hard drive. It outworks the operating system and the BIOS. The operating system and the BIOS with limited abilities cannot deal away with the bad sectors of hard drives and read the lost data slowly. It can read bad sectors to recover the lost data. It has various read commands to repair physical damage by recreating the image of the damaged data.

Hard Disk Drive data recovery imaging entails some handling issues for resetting or repowering unstable drives when it skips bad sectors or does not respond to them and takes long time for reading. It minimizes the possibility of drive degradation and imaging time by disabling some features like a G-List and SMART re-mapping through pre-configuring drives.