Changing Raid Hard Disk With Folder Up Switched Off

(sorry that should be duplication not up !!!)

Hi Chaps

Got a bit of query with regards to the hard drives in my WHS... few details:


Its an Acer Aspire H340
2GB Ram
Intel Atom 1.6 + 1.6 GHZ

I have turned off all folder duplication.

Im looking at the pic and it appears that Physical Disk 1 is 596GB... im looking to create more space so could do with changing that disk to a 2 or 3 tb one.... How can i make that an individual drive so i can copy any data from it ..... and remove the disk, then insert a new one and make that part of the RAID Disk again ?

Any help would be appreciated