FW800 drives slow when FW400 drive plugged in


so today, newertech guardian maximus arrived owc. 500 gigabytes of raid1 goodness. plugged imac's fw800 port, , started copying on stuff. started off 1 gig file imac's hd maximus. , slow hell. progress bar moving, , said 10 minutes left copy. rediculous.

so, decided turn off acomdata drive have plugged fw400 port. tried transfer again, , done in matter of seconds, how should be. turned acomdata on again, did copy, , slow again. rebooted in case, tried again, same thing. oh, , tried copying same file acomdata drive , slow. long both drives connected, entire firewire bus slows crawl

so, decided see happen if daisy chain on fw400 port. plugged maximus acomdata's port, , acomdata plugged imac. and.....it's fine. transfer speeds little bit slower on working 800, seem normal firewire 400.

while i'm glad i'm not @ parallel port speeds anymore, bought fw800 drive increased transfer speed. , need use both drives @ same time. what's wrong here? known issue imacs or something? it's pretty crappy can't use both firewire ports @ same time.
 



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