Crucial SSD's not recognised in optical bay with HDD Caddy
Some Crucial SSD's may not seem to work when you install them in your HDD Caddy and when they are connected through the optical bay. The Crucial SSD are not recognised will not show up in your explorer. However other brands like Samsung EVO do not have these problems. This does not mean HDD Caddy will not work with Crucial SSD. A simple fix is to update the firmware of your Crucial SSD. It is not only a fix for this problem but also most updated firmware have fixes for other problems and future problems. It is good to have your SSD working with the latest firmware.
You can find updating tools and information on the website of Crucial.