Up to 5 seconds for me (on a 6-disk RAID-0 partition).
Well, who has such a thing, actually ?
Personally I don't believe that too many gamers have 6 discs built in ...
I agree, only real PC enthusiasts have setups like that as it does improve performance. However the majority of gamers have a single HDD setup. Downside of RAID 0 is good performance but if one of the drives fails you loose the whole volume. If I were setting up a high spec PC & had the room for 6 drives I'd choose RAID 5 as it gives performance with redundancy.
I wouldn't consider myself a hardcore PC user but I do have 2 500gb drives mirrored as I'm fed up of HDD failures and the incovenience of a re-install of everything. The games run from a 300GB WD Raptor single drive which is connected to the same controller as the system drive. The 10K RPM hdd did make a difference in my old PC but not in my new one. Must be a controller issue.