Using an external hdd as internal hdd?

[HyperCity]

Hi,
One of my friend want me to convert his external hdd to convert into internal hdd. I mean to say that he wants his external hdd to be connected to his IDE or sata connection whatever possible so that he dont have to purchase an internal hdd now .
I don't know about what he is exactly asking & if this is possible?
DO you guys if this is possible in any way?

Please help me!

[Yuvraj]

I really don't understand what are you trying to ask here?

[MACAWI]

you can buy a kit to convert an internal hard drive to an external hard drive. There are a variety of connection options, including serial, USB and Firewire. One company that makes these kits is Addonics.