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What Is RAID?

RAID is short for Redundant Array Of Independent Drives, and is a method of utilizing several hard drives to store data while giving the appearance to the end user that only one hard drive is being used. RAID can be achieved through the use of the appropriate hardware (several hard drives connected so that they can be used as a single hard drive) and through software (which takes several hard drives and then manipulates the operating system so they appear as a single drive). While RAID is most commonly associated with servers it can also be used on individual workstations; in particular labor intensive workstations that store a lot of data.

The Advantages Of Using A RAID Hard Drive Structure

RAID drives arguably offer greater security against data loss because the failure of a single drive is compensated for the by the fact that data is actually stored on several different drives. This means that even if an entire drive fails or becomes corrupt the data can still be located on one of the other drives. It is also believed that RAID offers a much greater throughput of data, hence its common use in servers as well as labor intensive computers.

Not A Complete Solution To Prevent Data Loss

While it stands to reason that RAID offers these advantages it does not negate the need to create external backups, especially ones that are stored remotely rather than locally. The most simple form of RAID is known as RAID 1. This uses two drives – the main drive and a mirror drive. As data is written to the main drive it is also copied exactly to the mirror drive. Should the main drive fail this means that you still have all the information and data as stored on the mirror drive. This can be accessed and can replace your lost data.

RAID Summary

More extensive and functional versions of RAID can use four drives or more but the basic underlying principle remains the same. A mirror or a number of mirrors of all saved data are created in order that if one physical drive fails you can still access the data that you might have otherwise lost. This is a good method of preventing data loss through a failed hard drive and can even prevent some data loss that is caused by corrupt files but it can not prevent all forms of data loss.

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