IndianD,
Not really sure what you are asking, is it if you can take the hard drive out of the Dell laptop and put it into a computer without a hard drive?
If that is your question, then yes you should be able to!
You might need to get an adapter for the smaller laptop hard drive if you are trying to use it in a regular computer. They sell these in most computer stores, we did it to recover data off a dead laptop, we pulled out the hard drive and connected it as a slave with the adapter in a regular desktop PC.
If that is not what you are asking, you might want to be a littler clearer as to what you are trying to do and what kind of PC or external device you are trying to use!
Hope this helps!
E.A. Broda
CCNA, CCDA, CCAI, Network +