Automatic On / Off switch not working
Automatic On / Off switch not working.
Both USB and FireWire put a small amount of electricity through the connection. The automatic power switch on LaCie drives works by measuring power changes in the data cable.
Unfortunately, not all computers change the amount of power coming from those ports. Many keep the power on so it is possible to charge USB devices (cell phones, mp3 players, etc.) while the computer is off.
As the power amount doesn't change, the drive is unaware when to shut down.
Verify this by shutting down the computer, then unplug the computer from power for a while. The drive will shut down when the power stops coming from the ports.