I use my older notebook with the larger screen to read the newspaper, etc. in the kitchen. It is making noises every now and then so probably needs a new hard drive. Can I upgrade from a 40 GB, 5400rpm, ATA-5 to a 80GB, 5400rpm, ATA-6? What is the difference between ATA-5 and ATA-6? e-mail to patjessie@msn.com thanks