i believe these are SATA and 2.5". here is one of the part numbers i looked up in the tabook, http://www.compsource.com/pn/41N5692/Lenovo_1223/. @ kpvic: well I don't think there's anything special but at this price point, it's really nice ESPECIALLY the SXGA+. the SXGA+ are really hard to find these days. You get the beautiful trackpoint and awesome keyboard, great battery life (8 cell). so for $400 + upgrade of HDD and possible battery upgrade, I think it's a great deal and I have been looking only at lenovo tablets since I love them so much, haha.