External Firewire 800 hard disk kills internet connection

Hi,
I am having the following problem:
1. Plug Seagate FreeAgent GoFlex 1TB drive into Macbook Pro via Firewire 800
2. Internet connection dies.  By "dies", I mean I disconnect from the wifi network.  The degree of death varies from complete lack of visibility of the wifi network, to visibility but cannot connect ("connection timeout" when entering the password (which I should not have to enter anyway, as it's cached in my keychain)), to connection but no IP address given by the router via DHCP, to sometimes getting an IP but being unable to ping any other IP address on the network apart from my own.
3. Ejecting then disconnecting the drive physically, fixes the problem.
4. Connecting the drive via USB instead of FW800, does not reproduce the problem.
5. Connecting any my 500GB Lacie rugged drive via FW800 does not produce the problem.
Like the guy in this discussion (http://discussions.apple.com/message/15615649#15615649), this is only happening with my Seagate FreeAgent GoFlex 1TB drive and only when I connect it via Firewire800.  With any other drive, OR if I connect the Seagate via USB, all is OK.  Note that I'm re-posting this discussion because that other guy accidentally marked the problem as "fixed", but it was never solved.

When the firewire card is not connected, I get the following screen in system profiler:
FireWire Bus: powerbook's built-in FireWire bus
Maximum Speed: Up to 800 Mb/sec
OXFORD IDE Device 1:
Manufacturer: OWC Mercury Elite Pro AL
Model: 0x0
GUID: 0x1D2020092025F
Maximum Speed: Up to 800 Mb/sec
Connection Speed: Up to 800 Mb/sec
Sub-units:
OXFORD IDE Device 1 Unit:
Unit Software Version: 0x10483
Unit Spec ID: 0x609E
Firmware Revision: 0x102
Product Revision Level: 3.AA
Sub-units:
OXFORD IDE Device 1 SBP-LUN:
Capacity: 232.89 GB
Removable Media: Yes
BSD Name: disk1
OS9 Drivers: Yes
S.M.A.R.T. status: Not Supported
Volumes:
250 Gb:
Capacity: 232.76 GB
Available: 203 GB
Writable: Yes
File System: HFS+
BSD Name: disk1s10
Mount Point: /Volumes/250 Gb
Notice that the connection speed of the hard disk is 400Mb/s in the first, and 800Mb/s in the second.
The reason I'm fussing about this is because I'm using the hard drive with Pro tools, which officially supports Firewire 800 hard disks with the Oxford 912 chipset (which is what this one's got). And I've had a lot of problems bouncing to disk, even with just a stereo mix (96KHz 24 bit) Where Pro Tools (M-Powered) says that it can't read data from the hard disk fast enough!
I just want the hard disk to run at 800Mb/s and the audio interface to run at 400. Am I asking too much?
Someone must know how to do it.
Thanks for your help!

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