When files have been mistakenly deleted and need to be recovered, data recovery is necessary. This is the act of retrieving deleted or erased files using one of several methods. One example is third-party software, which can be purchased and used to recover files. There are many software utilities that can perform data recovery successfully, ranging from £20 to £200, depending on how well the data is recovered.

There are also companies that will perform data recovery for a range of fees. Data recovery companies specialize in difficult cases of data recovery and when a software utility was not successful. These companies use more complex processes to retrieve deleted or erased data, processes that may not be used by third-party software. For example, a hard drive that has been in a fire may have to have its interface board or other parts replaced before data could be accessed.

Soure: http://www.computerhope.com/jargon/d/datareco.htm

Data recovery is the process of restoring data that has been lost, accidentally deleted, corrupted or made inaccessible for any reason.

In enterprise information technology (IT), data recovery typically refers to the restoration of data to a desktop, laptop, server, or external storage system from a backup.

The data recovery process may vary, depending on the circumstances of the data loss, the data recovery software used to create the backup, and the backup target media. For example, many desktop and laptop backup software platforms allow end users to restore lost files themselves, while restoration of a corrupted database from a tape backup is a more complicated process that requires IT intervention. Data recovery can also be provided as service. Such services are typically used to retrieve important files that were not backed up and accidentally deleted from a computer’s file system but still remain on disk in fragments.

An organization’s disaster recovery plan should make known who in the organization is responsible for recovering data, provide a strategy for how data will be recovered and document acceptable recovery point and recovery time objectives.

Source: http://searchdisasterrecovery.techtarget.com/definition/data-recovery

A hard drive is nothing more than a magnetised storage area. Your Operating System is stored on your hard drive, as well as all your software programmes, like Microsoft Word. The hard drive is actually a few circular disks stacked one on top of the other. A little arm moves over the disks and writes things to these circular platters, and reads them. When you save a file or create a new folder, think of these circular platters being written to and you’ll have a basic idea of just what your hard drive is.

A hard drive is given a letter of the alphabet for convenience sake, and in most computers this will be the letter C. That’s why the hard drive is popularly know as the C Drive. There are other drives on your computer. These are the usual drives on modern

Source: http://www.homeandlearn.co.uk/bc/bcs1p4.html

RAID (redundant array of independent disks, originally redundant array of inexpensive disks) is a storage technology that combines multiple disk drive components into a logical unit. Data is distributed across the drives in one of several ways called “RAID levels”, depending on the level of redundancy and performance required.

The term “RAID” was first defined by David Patterson, Garth A. Gibson, and Randy Katz at the University of California, Berkeley in 1987. Marketers representing industry RAID manufacturers later attempted to reinvent the term to describe a redundant array of independent disks as a means of disassociating a low-cost expectation from RAID technology.

RAID is now used as an umbrella term for computer data storage schemes that can divide and replicate data among multiple physical drives: RAID is an example of storage virtualization and the array can be accessed by the operating system as one single drive. The different schemes or architectures are named by the word RAID followed by a number (e.g. RAID 0, RAID 1). Each scheme provides a different balance between the key goals: reliability and availability, performance and capacity. RAID levels greater than RAID 0 provide protection against unrecoverable (sector) read errors, as well as whole disk failure.

Source: http://en.wikipedia.org/wiki/RAID

Crewe is a railway town within the unitary authority area of Cheshire East and the ceremonial county of Cheshire, England. According to the 2001 census the urban area had a population of 67,683. Crewe is perhaps best known as a large railway junction and home to Crewe Works, for many years a major railway engineering facility for manufacturing and overhauling locomotives, but now much reduced in size. From 1946 until 2002 it was also the home of Rolls-Royce motor car production. The Pyms Lane factory on the west of the town now produces Bentley motor cars exclusively.

Although the name Creu first appears in the Domesday Book, the modern urban settlement of Crewe was not formally planned out until 1843 by Joseph Locke to consolidate the “railway colony” that had grown up since around 1840-41 in the area near to the railway junction station opened in 1837, even though it was called Crewe by many, from the start.[1][2] Crewe was thus named after the railway station, rather than the other way round.

Crewe was founded in the township of Monks Coppenhall which, with the township of Church Coppenhall, formed the ancient parish of Coppenhall.[3] The railway station was named after the township of Crewe (then, part of the ancient parish of Barthomley) in which it was located.[4] Eventually, the township of Crewe became a civil parish in its own right also named, rather confusingly, Crewe.[5] This civil parish changed its name to Crewe Green in 1974 to avoid confusion with the adjacent town, which had been made a municipal borough in 1877.[6]

The railway station remained part of the civil parish of Crewe, outside the boundary of the municipal borough until 1936.[7] So, throughout its history, the town of Crewe has neither been part of, nor has it encompassed first the township of Crewe, later the civil parish of Crewe, and later still the civil parish of Crewe Green adjacent to it, even though these places were the direct origin of the name of the town via the railway station which was also not part of the town before 1936. An old, local riddle describes the somewhat unusual states of affairs: “The place which is Crewe is not Crewe, and the place which is not Crewe is Crewe.”[8]

Source: http://en.wikipedia.org/wiki/Crewe