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:| hey i hope this is the right forum i came across a mirror drive and did not understand the concept is it still adding to my hard drive or is a extra drive
 

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It's a form of redundancy for hard drives. Basically, you have two exact same drives and the data is written to both drives. If one fails, you have a "mirror" of it as a backup.

Aka: RAID 0.

RAID: Redundant Array of Inexpensive Disks (an old term - disks used to be VERY expensive).
 

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ok raid so to understand you better is it a back up software or is a file of some sort and is it useful
 

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RAID is a Redundant Array of Inexpensive Disks . Therefore, it is hardware - two or more disk drives.

Your disk drive is a mechanical device. I read somewhere the average life expectancy of a disk drive is about 4 years. When it fails, expect everything on your disk to go bye bye.

If you value what's on your hard drive, you should either implement RAID or backup or both.

RAID is usually used in servers. Not many people have it on their home PC's. However, IDE (most home hard drives are IDE) RAID is becoming more common. SCSI is mostly used in an enterprise setting - ie. business.

Some OS' can do what is called "software raid" meaning that the OS takes care of writing to the disk drives. However, most professionals would recommend using "hardware RAID" meaning you use a special "RAID Controller" hardware card to manage the disk Input/Output (IO) process.

There are different levels of RAID describing different schemes - the most commonly referred to are:

RAID 0 - Mirroring.
RAID 1 - Striping
RAID 0+1 or "10" - Mirroring and Striping
RAID 5 - Striping with Parity.

RAID 5 is usually preferred in a business/enterprise setting because it will allow 3 or more drives to continue to operate, even though one has failed, without data loss.

HTH!
 

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I love these little lessons it like reading a "for __ " series of textbooks. (I'll let eveyone fill in the blank):D

And you make it allot more simple to understand than I could ever hope to... Keep it up.
 
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