• Your computer not booting up or does not recognize the hard drive
• Accidental file deletion
• Computer viruses
• Damage due to a power failure or power surge
• Software program failures
• Corrupt or missing critical file system structures
• Partitioning or boot-up problems
• Hard drives that have been fdisked or formatted

In-House Professional Recovery
In-house professional data recovery is suitable for physically damaged media, media that has been dropped, media that has been in fire or water or for internal mechanical or electric problems. Our highly trained engineers can recover data from every operating system and every storage device in every data loss situation. For a comprehensive range of our data recovery services, visit our dedicated website www.datarecoverydoctor.co.uk. You will find detailed information about our data recovery service by visiting Data Recovery Doctor.

Professional Recovery Data Recovery

In-lab or in the Clean Room
In partnership with industry leaders in data recovery, we can recover data from virtually every operating system and storage device in any data loss situation, using proprietary data recovery tools and techniques, without voiding equipment warranties. computerdoctor.co.uk data recovery team particularly recommend this service in the following circumstances:

• Physically damaged media
• Media which has been dropped
• Media which has been in fire or water
• Internal mechanical or electric problems

The total cost of your recovery depends on the nature and severity of your data loss situation. CALL US FOR COMPUTER SERVICES AND DATA RECOVERY ON 0207 516 1077 for a quote.

For  a comprehensive range of our data recovery services, visit our dedicated website www.datarecoverydoctor.co.uk. You will find detailed information about our data recovery service by visiting Data Recovery Doctor.

If the answer to any of the above questions is YES, then we certainly can help. Recover your data quickly and easily using our Data Recovery service.

What is data recovery?

Data recovery is the process of recovering data from primary storage media when it cannot be accessed normally. This can be due to physical damage to the storage device or logical damage to the file system that prevents it from being mounted by the host operating system.

How can physical damage happen to a disk?

A wide variety of failures can cause physical damage to storage media. CD-ROMs can have their metallic substrate or dye layer scratched off; hard disks can suffer any of several mechanical failures, such as head crashes and failed motors; and tapes can simply break. Physical damage always causes at least some data loss, and in many cases the logical structures of the file system are damaged as well. This causes logical damage that must be dealt with before any files can be recovered.

Most physical damage cannot be repaired by end users. For example, opening a hard disk in a normal environment can allow dust to settle on the surface, causing further damage to the platters. Furthermore, end users generally do not have the hardware or technical expertise required to make these sorts of repairs; therefore, data recovery companies are consulted. These firms use Class 100 clean room facilities to protect the media while repairs are made, and tools such as magnetometers to manually read the bits off failed magnetic media. The extracted raw bits can be used to reconstruct a disk image, which can then be mounted to have its logical damage repaired. Once that is complete, the files can be extracted from the image.

What is logical damage?

Far more common than physical damage is logical damage to a file system. Logical damage is primarily caused by power outages that prevent file system structures from being completely written to the storage medium, but problems with hardware (especially RAID controllers) and drivers, as well as system crashes, can have the same effect. The result is that the file system is left in an inconsistent state. This can cause a variety of problems, such as strange behaviour (e.g., infinitely recursing directories, drives reporting negative amounts of free space), system crashes, or an actual loss of data. Various programs exist to correct these inconsistencies, and most operating systems come with at least a rudimentary repair tool for their native file systems. Linux, for instance, comes with the fsck utility, and Microsoft Windows provides chkdsk. Third-party utilities are also available, and some can produce superior results by recovering data even when the disk cannot be recognized by the operating system's repair utility.

Two main techniques are used by these repair programs. The first, consistency checking, involves scanning the logical structure of the disk and checking to make sure that it is consistent with its specification. For instance, in most file systems, a directory must have at least two entries: a dot (.) entry that points to itself, and a dot-dot (..) entry that points to its parent. A file system repair program can read each directory and make sure that these entries exist and point to the correct directories. If they do not, an error message can be printed and the problem corrected. Both chkdsk and fsck work in this fashion. This strategy suffers from a major problem, however; if the file system is sufficiently damaged, the consistency check can fail completely. In this case, the repair program may crash trying to deal with the mangled input, or it may not recognize the drive as having a valid file system at all.

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