Hello Knarf,  With the NX200 you could get a 4 disk Raid 5 of either 2TB, 1TB, 500GB, or 250GB drive sizes. So you can upgrade to the max of 4x2TB drives for your NX200. Now you will need to replace the drives one at a time first. Once that is done then you will need to go into open manage and select the virtual disk & if you right click you should be able to expand the disk to use the free space. Now for your virtual disk you will not be able to expand it as it won’t be able to due to that virtual disk being an MBR disk.   Once the disk has been expanded then you will need to go into windows and expand the disk in windows disk management.  Please let us know if you have any other questions.
This seems like a question that would be answered in the product manual, but I'm unable to find it. I have one drive in the current 1Tb raid 5 that is failing. The server is about 5 years old so i would like to replace all of the current 250Gb drives to increase the overall capacity.  Does anyone know the maximum drive and raid specifications for this configuration?  Can anyone direct me to documentation on updating all drives?  Thanks in advance for your assistance. Knarf
NX200 with PERC S3 raid controller. Maximum drive size and configuration in 
raid 5.