s long as the notebook is 1998 or later you shouldn't have too many problems. IBM and toshiba laptops have used 100% standard 2.5 inch drives for a long time now. I just put a 20 gig in my thinkpad... not hard. You do need to watch out for form factor: there are 3.
9mm is newest and smallest, 13.5 is older and more common, 19.5mm is usd for some drives. Measure your old drive first. If you want the 4gig IBM travelstar I pulled from my thinkpad PM me and maybe we can work something out.