Help Please

hi i need help to put burned dvds back on my hard drive

i was backing up my dvds and was ripping them into a folder on my hard drive using dvd shrink. i then burned them onto dvd-r using ashampoo burning studio, they play fine on my dvd player but i cant play them on my pc or back them up on my pc again because the dvds are not being recognised by my pc anyone know what i need?