There's a hardware bypass for this issue. You should cut pin 1 on the hdd cable (reset signal). Then when you Ctrl+A+A it just reset the computer not the HDD aswell hence it will be ready to go on the fly. You might have already done this already or you reset doesn't spin down your hdd compleatly making it ready... anyway the above needs to be done for next thing to be possible.
TP9 and TP10 on the motherboard when connected together resets the computer just as when holding Ctrl+A+A (very handy when towering your A1200). With this knowledge it's just a matter of making a small surcuit that when power on the computer holds these two TP's connected for 2-3 sec... resulting in the Amiga being held in reset on startup but the hdd (as we cut the reset signal to it) spinns up and is then ready when the hardware resethold is released.
