Greetings,
There is another option to make a "non-removable" disk removable.
You can buy (for around $45.00) a docking bay for a "removable" hard drive. It can lock into place to be recognized as a second (or third) hard drive, and it can simply be unlocked and slid out of its bay.
The docking bay itself consists of two components. The rail into which a carrier is easilly slid in and out of, which takes up one of the 5-1/2" bays in your case. Inside the carrier is a standard hard drive.
It takes no time at all to install, it's setup as a standard hard drive, and it can be removed and carried away in about 1 second.
Just a thought.
Regards,
Maxwell