Just out of interest, cancerboy, do you have a plug and play charger on a wireless controller plugged in when you do this? Having that plugged in when you switch off leaves a good chunk of the box running still (fans run, etc), so that could be why your disk spins up, and not others.
I have to admit, I haven't tried your method but here's another possibility. Mine didn't work at all when the console was in the vertical position, but works 100% when in the horizontal postition.
I'm using Verbatim media on a Pioneer 109 burner with v1.4 firmware.