what date image are you using m8
there are a few rogue images floating about that fail to recognise drives
another thing to try, if your drive has an external power supply, tunr off both the TM and the HDD, turn on the TM and within a second or 2, turn on the power to the HDD as well, they no initialise together
ive found this happens with IDE drives in caddys with external power supplies quite a lot when rebooting just the receiver