What should the real world transfer speeds be on the SATA drive?

I've getting the following speeds on my Hitachi Deskstar drive that shipped with my MacPro.
I read somewhere that the hitachi drives shipped running at a lower speed and one had to use the tools supplied on the Hitachi website (DOS disk!!) to enable the higher speeds.
This is the reading from Xbench.
Is this correct? 66mb/sec? Isn't this less than Firewire 800?
Sequential 100.30
Uncached Write 108.53 66.64 MB/sec [4K blocks]
Uncached Write 101.51 57.43 MB/sec [256K blocks]
Uncached Read 84.80 24.82 MB/sec [4K blocks]
Uncached Read 110.85 55.71 MB/sec [256K blocks]
Bit of a newbie to drive architecture, but what does the 3gb/sec come from???
Thanks in advance

FW is capable of 800 Mbps.
SATA has a bandwidth of 3Gbps
SATA 1.0 specifies a channel bandwidth of up to 150MB/sec theoretical.
SATA 2.x specifies 300MB/sec.
Compare that more to how Ultra160 SCSI shares or uses that for multiple drives (and there was some overhead and inefficiency that could result in loss of 10-15%).
SATA Port Multiplier controllers can share that 3Gbps with up to 5 drives.
My 10K Raptor has 84MB/sec writes, and about 75MB/sec reads.
Xbench is not accurate.
You might want to take a look at StorageReview -> Drive Performance DB.
Most 7.2K drives, PATA or SATA, are in the 60-65MB/sec range today.

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