How do I spin down a secondary disk when not mounted? I have Macbook Pro 13" (Early 2011). I replaced the SuperDrive with a SSD that now is my main disk. The existing HDD is used for Time Machine and nothing else. 

I have 2 problems with the secondary disk:


After a Time Machine backup, it stays awake way too long. I want it to go right back to sleep.
When I eject the disk, it keeps waking up after a while, and then keeps spinning forever.


How can I fix these 2 issues?

Edit
I found a program called Cocktail that you can set the sleep timer with, unfortunately this is for both disks. How will this affect the SSD?
Solution is a terminal command with which you can control the sleep timer.
I set it to 1 minute.

sudo pmset -a disksleep VALUE


This still means the disk wakes up every hour for the time machine backup, and also every 15 minutes-ish for god knows what reason.

But its much better than before, just annoying that it regularly wakes up for a minute, which is distracting.