There's a few solutions to access / re-use the hard disk. Your choice depends on what you want to do with it in the short / long term.
1) A
USB cradle that you can plug in to - quick, cheap, but not particularly robust and not really portable!
2) A
that turns the redundant HDD into portable USB storage.
3) use a
2.5 / 3.5" convertor and fit it into a HDD bay in a desktop PC
4) swap it directly into another laptop
5) get an
adapter kit that supports USB to 2.5 / 3.5 PATA / SATA drives.
Obviously you will need to ensure that the solution is appropriate to the disk - i.e. SATA / IDE.
Please note that the links are given purely as examples of their type, not as suggestions or endorsements!
SD