About: http://webisa.webdatacommons.org/341822007

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	A single main spot is used for reading data recorded on the track, and other four spots are subsidiary spots which are used for servo tracking and are not used for reading data.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com