RAID Explained!



So many of you guys must have come across the word RAID, and i am talking about the RAID in regard to computers and not an insect killer. You must have come across the external drive branded as RAID 0 drive or RAID 1 drive. Ever wondered what that is? This post explains RAID 0,RAID 1 and RAID 10.

In the world of computers, there are 11 types of RAID configurations to be exact. The most commonly used are RAID 0, 1 and 10. Other type of configurations are rarely used and i will not be explaining them. You can check out the other types on Wikipedia.

So what is RAID? Well RAID is an abbreviation for “Redundant Array of Inexpensive Disks”. It is a combination of hard drives in such a way that either it speeds up the read/write speeds of your hard disk drives (RAID 0) or it is used to backup your data (RAID 1) or can do both the jobs at the same time (RAID 10).


RAID 0:  

Raid 0 is used for speeding up the hard drives or the SSDs, on whatever you are using. It requires two identical hard drives.Image

Copying small files to a drive is faster than copying bigger files, because it reduces the strain on the hard drive and less heat is produced. In RAID 0, when you copy a file, the file is equally divided and each half is written to each of the drives (refer to the diagram) which makes read/write faster. Both the drives will appear as a single drive when you open My Computer and you get the complete added storage of the two drives.

However, RAID 0 is known for decreasing its reliability of the hard drives. Well you would ask why is that. Well that is because if either one of the drives fail, you lose all of your data and it cannot be recovered. So usually an SSD is used instead of a hard drive for a RAID 0 configuration.


ImageRaid 1 is used for data backup. It again requires two identical drives of the same capacity and speed but this time the same data is written to both the drives. Thus you get a mirror image of of existing drive. So if any one of the drive fails, you still have the other one as a backup. This configuration does not affect the speed of your drive as you are basically writing to a single drive. The other operation is happening automatically.

The downside of this configuration is that you only and only get to use the storage of a single drive. For example if i have two 1TB hard drives in RAID 1 configuration then i can use only 1 TB of total storage not 2 TB like RAID 0, so this method is a little expensive and requires at least 2 drives.

So that is what we call RAID, i will be adding RAID 10 as well maybe a little later. Till then see ya guys.


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