Adding a second hard drive to serve as an extension of the first

The computer is a Dell E310/3100 and has only a 60gb hard drive. She bought a 250gb SATA and doesn’t want a second hard drive-simply an extension of the first hard drive (C). She wants to place the larger drive in the mount of the smaller one and move the small drive to the second mount.
Is it possible to do this and have both hard drives being recognized as (C) and working as a single hard drive?
I hate to eat at your table and run but I’ve been up long enough that my back and neck are hurting soooo! much. Thanks for any help. I will check back in a few hours. PM me or e-mail lesakay@adelphia.net. Thanks!
Harmie Johnson