A partition is the name given to a part of a drive that has been turned into a "disk" for data to be stored on. You may have one or many partitions on a drive, and they will appear, if they appear to you at all, as if they were separate disks. However they can be hidden from you, commonly to hide important files, which may be the case for a notebook.
Rather than assume one exists and start messing about with it I think you either need the manual or to ask at the shop.