Can I add a second hard drive to Lenovo Think Centre m81

Hope this is the right sub for this!

My teen bought a Lenovo Think Centre desktop. The back says it's a m81 d7u. A friend of the family has given him a hard drive but I have no idea how to tell if the computer will take a second one or how to install if so. Searches tell me that "some" models of the Think centre will take a secondary drive, but I can't find anything to tell me what ones.