Question : Problem: What does "This product is designed for MD: special RAID edition" mean....

Hi,
I have a Dell XPS GEN5 tower & want to put a 2nd HDD in (I already have a 250GB Drive).
I have my eye on a Seagate Barracuda 7200.10 500GB (ST3500630AS http://www.dabs.com/ProductView.aspx?Quicklinx=44FT) but I am unsure about buying it because the product description has the following phrase at the end "This product is designed for MD: special RAID edition".

What does this mean?  Does it mean it cant be used as a normal 2nd SATA drive?  
Anyone have an XPS GEN5 and know if this drive works in it??

Thanks

Answer : Problem: What does "This product is designed for MD: special RAID edition" mean....

Results from additional research:  MD is a Linux extension.   In Linux, the MD extension implements RAID-0 (striping), RAID-1 (mirroring), RAID-4 and RAID-5 in software. That is, with MD, no special hardware or disk controllers are required to get many of the benefits of RAID.