recover his date or his data? If the first one, i don't think you want computer guys giving you relationship advice
I wouldn't think it'd be the same connection (2.5" drives i thought were always their own connection) but if it is in fact the same, plug it in and have at it. Can't hurt it that way. If it's not, find a buddy with a laptop and plug it in there and see if it boots up OR order a 2.5" to 3.5" adapter such as:
Notebook Hard Drive to Desktop Adapter (2.5" to 3.5") N/A
and plug it in that way.
If you're going to run it along side your normal hard drive you'll have to make sure the jumper settings are right or set it up as cable select. It may even give you the option to choose during bootup, i'm not sure.