The ThinkCentre Tiny 500GB Hard Drive Adapter Kit (0A65638) is a complete hard drive solution fully assembled that gives the end user the ability to add a 2nd hard drive to ThinkCentre Tiny PC. This solution can be applied right out of the box by sliding the assembled hard drive adapter kit directly into the ThinkCentre Tiny Storage Unit Kit (sold separately) to enjoy the benefits of a second hard drive for your ThinkCentre Tiny PC system.