Internal hard drive or external hard drive?

I have been using an IBM, T42, laptop for about 4years. The internal, 40, gig, hard drive is about 90% full. I want to install MS Office on my laptop, but I need more hard drive space. Should I get an internal or external hard drive? Can I install an internal, laptop, hard drive by myself or do I need to be... show more I have been using an IBM, T42, laptop for about 4years. The internal, 40, gig, hard drive is about 90% full. I want to install MS Office on my laptop, but I need more hard drive space. Should I get an internal or external hard drive? Can I install an internal, laptop, hard drive by myself or do I need to be qualified? Portability isn't an issue and I think my laptop has about three to four years of life left.
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