Hi ! Right now, I have a 13" MBP, 2.26 w/ 4 Go RAM... I still use the stock HDD, Fujitsu 160 Go, 5400 RPM... I'm ready to order a new HDD, Western Digital Caviar Black w/ 7200 RPM or maybe a Seagate 7200 RPM, not sure about that but both in 320 Go sz... Will I see the difference between my 5400 drive and a good quality 7200 one ?? it's for internet browsing, Photoshop, iTunes, music recording, Garage Band... Thanks !! Phil.