Magnetic drums are data storage devices consisting of a magnetic coating on a rotating drum. They have been used in early computers and were the primary storage form for mainframe computers in the 1950s and 1960s. Some synonyms for magnetic drums include drum memory, drum storage, and magnetic tape drums. Another term is drum magnet, which refers to the magnetic field created by the rotating drum. While magnetic drums are no longer commonly used in modern computers, they represent an important step in the history of data storage technology and paved the way for more advanced storage devices.