Yeah, i'm using Mass Storage.
Might be the USB on the PC itself - I've only used the work PC so far. Any way to find out which ports are hi-speed and which are not? In the Hardware Manager there's only one which is down as USB2 
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Gaming Rig: Q6600 @ 3.1GHz | 2GB OCZ PC6400 @ 700MHz 4-4-4-12 | H2O 1/2" custom system | Gigabyte G965P-DS3 | 700W | X1950XT 512 | Seagate 320GB, Samsung 250GB, 2 x 160G Samsung SP in RAID-0 | Dell 2001FP
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