| http://www.w3.org/ns/prov#value | - ing for hard disk data storage systemsUS5313612 *16 Feb 199317 May 1994Matsushita Electric Industrial Co., Ltd.Information recording and reproducing apparatus including both data and work optical disk drives for restoring data and commands after a malfunctionUS5321826 *27 Nov 199114 Jun 1994Kabushiki Kaisha ToshibaDisk control system in which spare disk and master disks are dynamically exchangedUS
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