Sunday, October 4, 2009

Windows 7 Hard Drive Striping and Mirror

One of the great new Windows 7 features is Hard Drive Striping and Mirroring. This feature was previously one reserved for Server products (at least in the XP family). So now that this option is available and what does it do? Read on for the explanation.



Mirroring and striping hard disk drives (HDD) is a form of RAID (Redundant Array of Inexpensive Discs) array. RAID takes 2 or more HDD and creates various configurations. For example you can set up an array of three (3) or more discs and have Windows recognize them as one (1) large disc. Alternatively you can have 2 HDD that get mirrored to only show one (1) HDD but in reality you will have a backup drive. More detailed information is available on Wikipedia. So what is striping and mirroring? Keep reading.

Striping - Striping is where you take two (2) or more HDD and configure them as one large HDD.  For purposes of this article think of it as taking a movie file and spreading it over two (2) hard drives for storage.  Then when you want to watch that movie, you open the file and since it has been striped the load performance of the movie will be greatly increased because it is being accessed from two (2) seperate drives.  This is a good thing because you can combine two (2) 1 Terabyte HDD together so Windows recognizes them as one (1) and in theory your drive performance will be greatly increased.

Mirroring -   Mirroring is when you take two (2) HDDs and combine them together for redundancy.  What is copied and stored on one (1) HDD is also copied and stored on the other.  This creates an automatic backup of the drives.  For example you have two (2) 1 Terabyte drives that have been mirrored together, instead of having a 2 terabyte drive now you still only have a 1 Terabyte volume BUT a backup is being created in the process.  Then if a HDD ever fails or crashes, you still have all the files available on the second drive. 


Sounds good right?  So how do you go about implementing this?  Well I am going to tell you.  For this article I am using two (2) Western Digital 1 Terabyte Green SATA HDDs.  This could also be applied if you already have one hard drive and are adding a new one to be the backup.  Make sure to backup the existing data before formatting.


Begin by installing the HDDs like you would any other drive.  Start and login to your Windows 7 box. 

Once everything loads, right click on Computer and go to manage.  This brings up the Computer Management Screen.

From the left column Choose Storage > Disk Management.

The bottom right box shows all the HDDs installed on your system.  Find your new HDDs and right click the HDD box.  You should now have a choice to setup mirroring. 

The next box will ask  you to choose the second drive, so choose your second new drive.  Once you complete this your new HDD will be converted to Dynamic Disks and then formatted to appear as on drive.

NOTE:  IF THERE IS ANYTHING STORED ON THE DRIVES IT WILL BE LOST.  The new array needs to be formatted and all previous data will be deleted.


This should be fairly straight forward.  As always ask any questions through email or comments and remember this is for informational purposes only, and I am not responsible for any damage or data loss as a result of this tutorial.

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