Hard drives only have a limited lifespan.
Once Andrew fixes it, I'd be looking to go a solid state drive for it.
I got all excited about SSD's too (I got a eeePC w/sata) - but their MTBF is crap - each "sector" can only be written X amount of times, then it's a bin job AFAIK? I know they use intelligent write strategies etc - but still.
Once the drive gets reasonably full - it will start swapping data all over the place, which would kill it even faster?
Still want one though! When the prices come down a bit more...