I Had run out of disk space on my internal 100GB disk. I bought this new 320GB disk, attached it to an external chassis copied / cloned my 100GB internal disk to it and ensured que la picture on the new disk 320GB disk bootable Was; Then Quickly and Easily swapped out my old 100GB disk and this new one put in (good hardware design by Dell), Then finally Increased the size of the partition copied / cloned disk image to the full 320 GB available in the new disk.
Sounds complicated goal Actually turned out to be quite an easy!