Years ago I got both the 8MB IBM 40GNX and a 16MB Toshiba GAX. The 40GNX is hands down much faster than the 40GB GAX; even faster than benchmarks show: http://www.barefeats.com/fire39.html
The 60GB GAX has higher areal density, but you can see, even the old 8MB GN does pretty well against it. The new IBM disks are better still.
The Toshiba I interested is the newer one MK6026GAX.
I wonder if the performance is the same. Will the 16M cache can save more tear & wear and battery life (as read&write) in real life.