I found the manual for that series laptop. 5-8 has some illustrations on the drive setup. In that drawing it looks like a PATA drive, but I realize it could be a generic photo. If you're sure that no adapter is needed, just buy a hard drive that will work for you (I recommend an SSD if you can wing it, instant performance boost for an older system) but of course buy what works for you. Any drive up to 750GB should be ok in this laptop. OEM systems can be picky about drive sizes higher than that.