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I could also password the setup utility and the HDD, then the ony way to log on would be to reset the CMOS by opening the case, if it can be done on a laptop!
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In my limited experience getting to laptop internals is fiddly, time-consuming, and error prone. If you haven't done it before I reckon I'd set aside 4-6 hours to disassemble/reassemble a laptop to find the cmos battery. I'd only try it on a laptop I was going to junk.
Is this your model? http://support.dell.com/support/edocs/systems/ins154...
Yes that is my model, it only has 150GB HDD! Not suitable now adays!
My othe pc I built myself 3 years ago and installed a 1TB HDD and that is half full! But I can add another 5 SATA HDD's if necessary, which I won't, perhaps one or two smaller capacity ones for back ups.
Thats the whole idea I wouldn't have to do it, as the laptop is being given away to Tesco for recycling! I am not keeping it or giving it to friend/s or people I know!