Troubleshooting SP 2 #22

After installing SP2 the Firewire connection speed slows down dramatically.

Microsoft explains this problem in a Knowledge base article and blames the Firewire SP2 drivers. Under some circumstances, the data transfer rate can be limited to the slowest rate of 100Mbits/sec.

A patch available from the URL below removes this limit. For Firewire controllers that have been added after SP2 has been installed, a delve into the Registry is needed as well.

Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\PCM394_hc_hw_id\1394_instance_id\DeviceParameters. This should contain an entry called Sidspeed. If not, create a new DWORD entry with that name and the Value Data set to 3.

support.microsoft.com/kb/885222

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