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MacBook Pro FireWire Bus
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Dedicated MacNNer
Join Date: Jan 2006
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Hi.
From experience with a last-gen Powerbook, I noticed that both the FW400 and FW800 ports illogically shared the same bus, and that if a FW400 device was connected to the FW400 port, any FW800 device connected to the FW800 port would suffer, and its thru-put would be pulled down to the lower speed (FW400).
I was just wondering, does the MacBook Pro suffer the same fate? Or, have Apple provided two independent FireWire buses this time 'round?
Thanks for any insight you can give.
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Grizzled Veteran
Join Date: Apr 2004
Location: Nagoya, Japan • 日本 名古屋市
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Apple's Page on Firewire Implementations
They both use the same controller, but it's designed to handle both protocols at once. I don't see why FW800 would suffer a lower speed, unless there's a design flaw.
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Dedicated MacNNer
Join Date: Jan 2006
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FW800 suffers FW400 speeds when used simultaneously with a FW400 device on the Powerbook.
I was hoping that Apple would have addressed this, but I guess they haven't?
Thanks,
onlyone-jc.
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Dedicated MacNNer
Join Date: Jan 2006
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Quite disappointing, really. But, it's still a great product, never-the-less!
Thanks,
onlyone-jc.
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Grizzled Veteran
Join Date: Feb 2006
Location: Northern VA
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Originally Posted by onlyone-jc 
FW800 suffers FW400 speeds when used simultaneously with a FW400 device on the Powerbook.
I was hoping that Apple would have addressed this, but I guess they haven't?
Thanks,
onlyone-jc.
wait what? is that true? I can see no difference when I unplug my iPod from the FW400 port when I transfer some video files to my FW800 external HD.
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iMac 24" | Core 2 Extreme 2.8GHz | 4GB RAM | 500GB HD
PowerBook G4 15" HR | 1.67GHz | 2GB RAM | 100GB HD
R.I.P 1995 Toyota Supra NA-T
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Dedicated MacNNer
Join Date: Jan 2006
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When both devices are connected, open the System Profiler, and select FireWire. You should notice (more specifically on the details listed for your FW800 drive) that it says that the bus is capable of up to 800Mb/s, but that it is currently only connected at 400Mb/s.
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Grizzled Veteran
Join Date: Feb 2006
Location: Northern VA
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it says my HD's connection speed is 800Mb/s and my iPod's connection speed is at 400Mb/s
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iMac 24" | Core 2 Extreme 2.8GHz | 4GB RAM | 500GB HD
PowerBook G4 15" HR | 1.67GHz | 2GB RAM | 100GB HD
R.I.P 1995 Toyota Supra NA-T
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Forum Regular
Join Date: Jan 2006
Location: Not far from a shop that sells Logic Pro
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Well done Velocity211, that's the test we needed to see 
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2.8 Ghz Unibody MacBook Pro 15" - 4GB Ram - Logic Pro 8.0
2.33 Ghz C2D MacBook Pro 15" - 3GB Ram - Logic Pro 7.2
1.5 Ghz G4 PowerBook 12" - 1.25GB Ram
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Dedicated MacNNer
Join Date: Jan 2006
Status:
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It seems I had a bad Logic Board in my Powerbook. A replacement resolved the problem!
Well, that's good news not just for me, but for all of us!
Thanks,
onlyone-jc.
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