I have three daisy chained firewire 800 drives on my Mid 2011 iMac. Lately I have been having some problems with my computer.....I been trying to isolate the problem and the problems only seem to appear when the external drives are connected. Today I watched a YouTube video on daisy chaining and it said that to properly mount the drives you need to turn them on one at a time, wait till the first shows the icon on the desktop before turning on the second. Does this mean that I should unmount them every time before turning off the computer? Also, what happens if the computer goes to sleep? Should I turn off the energy saving feature of having the hard drive go to sleep after one hour of non-use? Will that mess up the hard drives? I have just been leaving the drives plugged in and turning the computer off and on with them mounted. Perhaps this is my problem.