Gideontech take a look at Vantec's mobile hard drive cage.

To add the hard drive, simply pull the silver tab, turn the key to the off/unlocked position, and pull. It sounds pretty simple on paper, but in reality, its very difficult to get it to release. I had to pull so hard on the tab the first time I opened it that I thought I had broken it off when it finally released. Once the lock is disengaged it releases easily, but the mechanism to lock the drive in place needs serious work.

Read more