Mike,

yes, OSX is more picky about everything (CPU, RAM, HD, ...)!
I ran a test tool over night (in OS 9). It completed four full sweeps with no errors found.

To answer some of the other comments: I didn't note the drives partnumber, but it's a current model Toshiba, so I'd venture to guess 4200 rpm (this is standard for all 2.5" drives but the 48GB Travelstars @ 5400rpm). It certainly doesn't appear to be slower than the stock 10GB Travelstar.

Also found a workaround: just set Energy Saver to never spin down the drive. The problem appears to be related to spin-up. Maybe this drive takes longer to come online and OSX times out and retries? Then on the retry it times out again, ...

Anyway, I'll have slightly lower battery life, but who cares!

Thanks for everybodys comments!

Armin

PS: car install almost done, just need the docking sled drilled...