At last its comforting to know that you can indeed put a faster drive in your Toshiba. The linked article, a person put a 5400RPM, 160Gb disk. The only problem a BIOS limitation preventing it seeing beyond 128Gb.
In another article on the same blog, this blogger found a way to get AERO effects working in vista on the same machine. Genius 🙂
You CAN do it!! : Vista Ultimate with nVidia Go5200 – there is hope!