In this document we will take a look at What is Data Recovery and Common Types of Hard Drive Failure
What Is Data Recovery?
Data recovery is the process of recovering data from storage media that, for one reason or another, is no longer accessible by normal means. This may be because the storage media to which the data was written (eg. a hard disk drive) has become damaged in some way it may be a hard disk that now clicks when powered on, or it may be a server with several broken hard drives that can no longer be accessed.
In other cases there may be nothing wrong with the media, but the data may have become lost due to it being accidentally deleted or overwritten.
Most of the time, data is held on hard disk drives. Hard disk drives can break in a variety of ways and a data recovery service can be used on any type of computer system that uses computer storage media.
Common Types of Hard Drive Failure - Explained
When a hard disk failure occurs on a system it can be for a variety of reasons, and it's important that the fault is diagnosed properly and correctly as this indictates the steps necessary in order to successfully recover the data.
There are four ways a hard disk can fail that will potentially lead to a loss of data:
Firmware Corruption / Damage - These type of faults relate to the micro programming on the hard drive. The drive will become inaccessible and need to be reprogrammed before the data can be accessed
Electronic Failure - Typically caused by a power surge, for example, plugging the wrong mains supply into an external hard drive.
Mechanical Failure - This relates to physical problems on the hard drive - for example, a head failure resulting from the drive being dropped or receiving a knock. The clearest indication that a hard disk drive has a head fault is a knocking or ticking noise when the drive is powered on
Logical Corruption - This refers to problems with the actual data rather than the storage media it is held on. For example, data has been deleted or operating systems re-installed etc.
At times a combination of these four is possible and the chances of recovering data depend upon the extent of the damage that has occurred.