Add a new Hard disk

Dear sir

I have a del Poweredge 2400 Server without hot swap the hard disk capacity is 40GB with NTFS partitioned. Now the hard disk capacity is full even C and D drive both are full i want to add a new hard disk from new hard disk i want to increase the volume of my c and as well as d
Could any one help me for this
Thank you very much in advance
Suhail