Data stored in a computer may be lost due to mechanical reasons like a head crash where the read-write head of the disk collides with its recording surface, a power surge, failure of the disk controller device, or due to a defective air filter. It may also be due to software-connected problems like virus problem, file corruption, problems in the operating system, or accidental erasure. In all these cases data recovery and backup services are an absolute must. Once any of these eventualities occur, access to data will be denied to the user in the normal way through the computer. In some cases data will be irretrievably lost as well. But in most cases, data is not lost. It is only access to it through the normal path that is denied and data can be retrieved through various other means. This process is known as hard disk data recovery. One way of reducing the possibilities of disk failure and the resultant need for hard disk data recovery is using the technology of Redundant Array of Independent Disks, which is better known by its acronym RAID. In this process data is replicated and stored in different hard drives. The computer senses these small hard drives as a single storage unit. The arrangement provides more storage space and speeds up the computer, and gives the machine more fault tolerance. The use of RAID is no foolproof solution for data loss. The advantage of RAID from a data recovery and backup services requirement perspective is that the data will be pretty much intact even if one of the drives fails. However, more than one hard disk from the group may fail and in such cases the process of hard disk data recovery will become a must. The word RAID was originally expanded as Redundant Array of Inexpensive Disks though later the word inexpensive was changed into independent. There are different RAID levels and some of the levels use striping, which is an interleaving process whereby multiple disks are reading and writing at the same time. This arrangement makes hard disk data recovery process from a RAID group a little more complicated than that from a single large disk. Data is retrieved in almost all cases even though RAID data recovery may turn out to be more expensive for the customer. Where disk damage is limited, connecting the damaged disk to another hard disk as a slave can retrieve data. There is also data recovery software used by data recovery and backup services providers, which is highly effective in most cases of data recovery. There are slight differences in the data recovery software used for different operating systems like Linux, Windows, UNIX, etc. Some of these software are available online. When hard disk failure is due to mechanical reasons like a head crash, data recovery using software may not always be possible. The damaged parts of the drive will have to be replaced in such instances and data will have to be retrieved from the reconstructed drive. This is a slightly complicated procedure but many data recovery and backup services provide the necessary help, thereby saving most of the data.
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