About: http://webisa.webdatacommons.org/228739815

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	(1) A transparent disk made of a material such as glass or quartz is substituted for the hard magnetic disk, and is rotated at the normal speed for the system with the slider in its normal operative position.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com