Actually I was a bit too harsh above - it's not really a udev bug, if I read the thread on linux-usb correctly it is actually a bug in hdparm but until that gets fixed I vote for disabling the mentioned udev rule alltogether which would make it a udev bug too ;)
Actually I was a bit too harsh above - it's not really a udev bug, if I read the thread on linux-usb correctly it is actually a bug in hdparm but until that gets fixed I vote for disabling the mentioned udev rule alltogether which would make it a udev bug too ;)