Firewire 400 transfer rate

Hi all,
i've bought a brand new G-RAID from Apple Store and after three weeks i gave it back because noisy and slow on transfer.
This morning i took my new G-RAID and few minutes ago i've checked with speedtools its transfer speed and bench recived is more or less the same of the one i've changed.
(see below)
Good news is that is no more noisy. Bad news is that to move my aperture library is taking ages (66gb).
Before to see apple store about this issue i've contacted G-Technology and also for the support guy that followed the performances don't sound great.
I've also tried to perform speedtools check removing all the drive connected (a Iomega 1TB attached to USB) but still the same speed average.
As it sounds strange that i'm having problem with both the HD i'm wondering if the issue could be related to my macbook and the Firewire 400 itself.
Looking to the bench below, what do you think? do you have any suggestion to check it? I've another mac book (white one) having firewire 400 so i can perform the same checks.
Or, do you think that average speed is normal and i should just get a more performant mac?
Thanks for your help.
QuickBench(TM) 4.0 Test Results
©2000-2007 Intech Software Corp.
Test file created on samedi 11 septembre 2010 at 15:15:03
Test Volume Name: G-DRIVE
Test Volume Type: MacOS Extended
Test Volume Size: 1.818 Terabytes
Test Volume Free Space: 1.818 Terabytes
Allow Disk Cache Effects: Disabled
All reads and writes performed sychronously
Standard Tests Not Run
Extended Tests Not Run
Extended Tests Not Run
Custom Test Results:
Transfer Size: 200 Megabytes
Transfer Count: 10
Contiguous File Only: No
Custom Test Cycles: 2
Custom Read Custom Write
Max Speed 19.078 17.131
Ave Speed 18.902 17.072
Min Speed 18.775 16.944

Justin Nightingale...
It much depends on either counterparts, the built in IDE Controler or the FW Bridge. Next kicks in the other parameters such as HD specs and so on.
Now the IDE bus is more than likely shared with the Optical Drive on a Mac mini. Internal 2.5" form factor HD do not seem as fast as the 3.5" HDs. As you may see what I am driving at, there is some trivial bottlenecks here.
Next is that FW is processor direct, so it can cut out some of the bottlenecks as long as the 3.5" HD is concerned. Dropping down to a 2.5" HD reduces any speed advantages again.
So my conclusion as long as a Good FW based on an IDE 3.5" HD it should the tops of the speed race. Next probably would be a near toss up but more favorable FW /2.5".

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