They work perfectly on mine...
They dont dig using files from an external hdd (or ssd) though... even on a thunderbolt external powered LaCie 2big 6tb external drive they dont really dig it..
But the minute you put stuff on the internal hdd it is fine.
I mean, it isnt uncommon for it to work better on the internal hdd, but it just ends up loading alot when you are even doing things like lightroom photo editing (even at 335mb/s transfer speeds)