Which ones, specifically? Spindle speed can affect performance but it's not the only variable that does.Is there any major speed difference between the two hard drives?
You don't get something for nothing. How do you think the faster RPM's are achieved?Some say 7200rpm drains battery faster.
Possibly, if you are thin provisioning your VM disks, they will get fairly fragmented as they grow - and higher rpm drives are quicker at moving to different file fragments.I noticed a big increase in performance using a 7200RPM hard drive vs a 5400RPM drive. Maybe using virtual machines has something to do with it though?