hhhmm, so isnt this pointless unless you have an sas drive? those speeds are faster than a 7200 HD arnt they?
Not really, for two reasons.
The first part is that the technology in conventional 7200rpm 3.5" HD's have been bumping up against the bandwidth limitations of SATA-I for awhile, particularly for peak I/O bursts. What they've been doing to compensate is to use larger buffers, which lets them 'spread out' the peak I/O burst and results in a higher total bandwidth utilization.
The second part in a single word is "RAID". When you have multiple spindles on the same I/O port, you get more data throughput and thus, the ability to go well above SATA-I bandwidth (particularly for peak I/O).
Bottom line is that a jump from FW800 to FW3200 is a good thing.
-hh