I got some strange results.
on a good day I got 70+mbps for Read Burst Speed. (the bottom, horizonal red bar) (I think I got this result in Win 98)
on a bad day I got 4mbps (not a typo) for Read Burst Speed. (in win 2000)
here's the specs:
T-bird 800@800, IBM 30GB 7200 (split into 2,6,4,3,10,3...