The Canon camcorder cannot coexist with any device that supports FW800 like
the Extreme; this is a Canon limitation.
Solution is to establish separate FireWire bus for the camcorder to isolate
from other FireWire drives. Can be added with PCI card in G4/G5 computers or
PC Card in PowerBooks.
This is the only workaround.
Problem is due to camcorder not supporting the FW800 interface as found in
the Extreme, even when used with the FW400 port.