if you need a encloseure for your 2.5" 7mm thick or less hard drive and you need you files read only this is for you. If you want to add files just saftely disconnect the hard drive flip the switch reconnect to the computer and you can write again.
When Im Putting viedo on hard drives and using one machine for that purpouse and then filling that hard drive I lock it down so when I move it from computer to computer my videos stay good and dont get messed up