HDD Help

I have a dell inspiron n7110 which came with a 640gb hard drive, but I recently put in a custom optical bay with a 1tb drive inside and replaced it with the original dvd drive.

Although the additional hard drive is working great, my problem is that when I try to shut the laptop down, sometimes, about 50% of the time, the laptop will turn off but the power stays on, sending power to the additional hard drive.

But the strange thing is that this isnt a regular occurence, sometimes when I shut it down, it shuts down completely.

So my question is, does anyone know what is causing the laptop to stay on and if there is a way to fix this.

Thanks in advance.

It is more than likley just writing data to the new hard drive as you are trying to shut it down my question is that after a while does it stop or is it just continual after you shut it offÂ