I have a MBA model #A1304 with 120 HD and I am looking to upgrade to a larger HD. I have tons of movies/pics/music and i was deleting movies to free up space as I was maxed out on a few occasions. I recently replaced the battery, so im assuming my warranty is void for cracking the case anyways (even though that is not an issue for me). While on this topic, I would also like to upgrade the RAM and this thing gets REALLY sluggish on me lately. I moved my whole itunes library to an EHD and stream my stuff while at home to my MBA so its taxing the RAM heavily.