I've got a Western Digital WD1000JB in my computer, on a mainboard that supports up to ATA133. I ran a diagnostic test on it using SiSoft Sandra, and it came back with a speed of around 15000 kB/s on average. It looks like the speed it should be coming back with is around 30000 kB/s. I have an Athlon XP 2000+ on a Gigabyte board with about 512 meg of RAM, of that matters at all. Do I need to change a jumper or something somewhere? I'd just like to get the speed that is available to the drive out of it.