I want to add another hard drive to my exsisting RAID 0 setup - how can i do this?

Hi all, wonder if somebopdy can help me
I have my computer setup as follows:
1 x SSD - used for my O/S - windows 7 ultimate 64bit
2 x 1 TB hard drives - WD black series in a RAID 0 arrar
Now Im slowly but surely running out of space on the RAID ( the two hard drives) so im thinking about purchasing 2 x more of these exact same hard-drives to add to the RAID but iv never done this before and obviously I cannot lose any of my data currently
saved on this RAID - as iv deleted everything I don't use or want
what is the best way to back all my data up and how would I add 2 x new hard drives to my RAID 0  so that it will include 4 x 1 tb hard drives in total
thank you hope somebody can help

Hi,
You have to know that with a RAID 0 (striped set), if any drive in the array fails for any reason, you will loose all data on the volume. In this case, the more drives you add, the greater the chance for failure--with increased I/O.
Being you already have a RAID 0 setup with two drives, you cannot just break the stripe--you will loose all data if not backed up. 
To effectively add another drive to your RAID 0 implementation, you will have backup your machine--making an image is the best option--break the array, add the drive and then restore your image.
About how to extend the raid 0, you may need some third-party tool to complete. Here is some references for you:
http://www.partition-tool.com/resource/extend-raid-software.htm
http://www.partitionwizard.com/resizepartition/extend-raid-0-partition-windows.html
Please Note: The third-party product discussed here is manufactured by a company that is independent of Microsoft. We make no warranty, implied or otherwise, regarding this product's performance
or reliability.
Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
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