There is no support for 2TB+ for XP SP3
You are also using a old version of the RAID software the newest is Rapid Storage Technology
If needed you may use EASEUS Partition Recovery should you need to.
Moving to Vista or 7 will not solve the problem of a partition being bigger then 2TB unless you use GPT from the start when setting up a partition.
I thought that the problem might be that I had two partitions on the volume, so after the migration
the driver wouldn't know how to distribute the new drive/space between them. So I decided to delete
the volume and reconfigure. Prior to that, I decided it would be a good chance to upgrade to RST.
Upgrade was successful, so I used it to configure my new volume, utilizing the full space of 4x1TB drives.
At that point I - finally - got the error message that the contoller's BIOS does not support volumes over
2TB, so I configured one volume utilizing only half of the total space. It is currently at 17% of the initialization
phase (about 3 hours have passed) so it's going to be a lengthy process. Since I anticipate no problems,
I will configure the remaining 50% in the same way.
I will post an update, but it will be well through the weekend.
Thank you for your feedback.