About: http://webisa.webdatacommons.org/46370142

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Background of the Invention The recording surface of a magnetic medium such as a tape or disk is generally comprised of ferrous oxide particles of varying sizes and shapes suspended in a polymer base.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr