dell D600 hdd upgarde

i have a D600 with a 1.6M and 1 gig of ram and a 40 gig hard drive dual booted with ubuntu and xp pro. i use it to do some programing work and what not with it for school (itt-tech) and when i am away from my desktop. so it works fine but having 40 gig (realy like 37gigs) it gets filled really quick with some photos and video.

i was looking to upgrade the drive to a 160 or so and have heard about other dells/systems not being able to be upgraded past a certain point. is there a limit to how big of a drive i can get for it

dont take my word for it but i think the D600 uses the 855PM Intel chip set and i couldn't find any thing about a limit. but when i called dell and asked the guy said he could get me a 80 gig for 100+. witch is way to much considering you can buy a 160 2.5 on ebay for 60$ new

its pata