Information recording and reproducing apparatus including both data and work optical disk drives for restoring data and commands after a malfunction

摘要: An information recording and reproducing apparatus has a plurality of optical disk drives including data drive for storing data, work or backup temporarily the and, preferably, cache memory. The are coupled to host device such as central processing unit (CPU) through an control controlling reproduction data. writes commands transmitted from into memory if required, drive. unit, on activation following malfunction, restores most recent state thereof by using contents drive, whereby number times writing is decreased so prevent loss occurrence problems in functioning apparatus, power failure hardware error.