About: http://webisa.webdatacommons.org/76394178

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	Any contact due to mechanical shock or other disturbance will result in two hard surfaces, namely, the ceramic recording head and the metal disk, impacting each other, creating a local defect or a scratch.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com