Figwit wrote:
But one final question… Pawson, you say that you keep your movies in subdirectories <Volumes/Drive/Movies/Genre/Title/file.ext> and it doesn’t need to rescan every time? Is this true for everyone else here? 'Cause I’d much rather put my files back into folders as I had them before <Volumes/Drive/Movies/Title/file.ext>, than leave them laying in my drive’s main directory <Volumes/Drive/file.ext>.
I’ve always had the media Library off… Everything I have is stored as Movies:\Genre\mediafile.ext or Movies:\Genre\Subgenre\mediafile.ext or TV:\Show\Season\mediafile.ext.
Now, granted I basically leave my WDTV Live on 24/7 for other reasons, so I don’t have all that many startups to worry about, but yes my attached drives still get “scanned” at power-up… it’s just not a full scan, as far as I can tell.
When the menu appears when the WDTV boots, after the “Loading…” screen, if I immediately go to “Videos → Local Storage”, only USB2 shows up. It usually takes about 10-20 seconds for USB1 to appear. USB2 was getting “scanned” during the “Loading…” screen, going by the flashing USB light and the drive activity.
So, I honestly don’t know whether that answers your question or not.
On the one hand, my drives still get “scanned” before they appear, but on the other hand, it doesn’t take 10-15 minutes. Certainly 10 or 20 seconds has been an acceptable wait to me, even if I wasn’t leaving it on all the time.
What I can do, however, is go turn the Library on and reboot, and see how long the drives take to appear then… if it’s the same few seconds, then I obviously get a full scan every time… if the drives take longer to appear, then the scanning I’m seeing is something quicker.
I’ll go try and get back to you. 
EDIT: well, this may take a bit longer for me to test… the WDTV yelled at me that there isn’t enough room to compile the library… I’ll move some files around and then try again.