How do you put your old hard drive back in?

I upgraded my hard drive with xboxhdm. It works but my old hard drive will not run in my xbox. How do i get it to work?

 

Why do you want to put your old HDD in....?


But, you probubly need to lock it

 

can you give a bit more info
does the xbox load up or do u get an error when u trun on the xbox.
if you get error 5 you need to lock your hd or error 6 if you lock the hd on another xbox