Laptop Drives

Hello,
I have 2 laptops (A Dell Latitude LM Model TS30GI) and a Compaq Armada 1700 I was wanting to upgrade the hard drives on them to a 20 GB but the question is what would I need to look for compatabiliy wise? I seen a generic drive
http://www.newegg.com/ProductSort/SubCategory.asp?SubCategory=380&page=2 but the question is would it fit and work in both of those model of computers as I have searched around but I could not find any specifications on what type of hard drive they take and I am wondering if that one would work as a replacement (I just want to make sure it has enough pins and so forth)