External Lacie disk doesn't shutdown

I have an external Lacie disk with an auto function. It works perfectly if connected to USB 2.0, but it doesn't power off with the Imac when connected through Firewire 800.
Lacie replied that it depends on the mac leaving the power on the bus.
Infact if I take the power cord off the Imac, the disk will power off.
Do you think this is something that apple can solve with a firmware update?
Thanks,
S.

Hi Srugoglo,
Welcome to Apple Discussions.
The power doesn't switch off on firewire 400/800 and is part of the standard. To change this would cause chaos with the firmware/software for lots of audio interfaces just for a start. Is you LaCie set to use the button on the front for anything in particular? I leave mine as a power button, to switch my LaCie drive off after the iMac has shut down. I have a d2 drive a few years old.
Karn.

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