I have 2 T7K250's in RAID 0, and I am reading burst rates of 311MB/s, but my system is actually slower than my old single raptor setup. WIndows boot up time for me with RAID 0 is about the same as a single raptor, maybe slightly quicker. (2-3 bars)
It seems you, (and me) were expecting a more noticable performance boost from SATA RAID 0, especially with these new Deskstars that are supposed to be so fast if 3gb/s is enabled with ftool.
My CS:S load times, and game level loads are slower with them, and the general OS responsiveness is slower as well.
I got these as a replacement for my raptor, (which died)after reading several favorable articles and reviews, including a comparison against a single raptor. I am a bit disappointed in the deskstars in RAID 0, though.
I RMA'd my raptor and WD actually shipped me out a new one the day after they received mine. I am going back to the raptor, and will stick with the raptor series for a while; the performance, warranty and service are great.
The Hitachi's seem like nice drives, and having 1/2 a terrabyte of striped love was cool, but I guess I was just expecting too much from them.