A decent HDD with a 1tb platter clocks over 150MB/s average R/W speed, with it being well above 200MB/s on outer rim. Average/non-uber-cool (and expensive) SSDs manage the same average R/W speed.
SSDs have ultra low access time for random read, though.
I recently bought a decent'ish 2TB HDD and it has the same average speed for sequential R/W as my somewhat older 120GB SSD on the various benchmarks i tried.