TravelStar Z5K500...
... utilising an impressive^H^H^H^H^H^H^H^H^H^H^H dangerous 636Gbit/in^2 areal density.
Packing 'em in a bit too tightly, methinks. If I have to use a mechanical laptop drive, I think I'll play it safe(r) and stick with units in the 250GB range...