Abstract: An optical recording and reproducing system having an accurate high-speed optical head positioning apparatus. In one embodiment, a positive acceleration is applied to the optical head until the optical head has moved half the distance to a target track. Thereafter, a negative acceleration is applied to the optical head to decelerate the optical head until the optical head arrives at the target track. Feedback control is not used while the optical head is moving, thus eliminating a delay in response time due to a limited servo band upon the transition from the positive acceleration to the negative acceleration.

Abstract: In a storage system having a main storage and a buffer storage accessable by a plurality of requesters, the buffer storage comprises a buffer storage data area having a plurality of storage areas for storing a portion of data of the main storage as a copy of the main storage for each predetermind storage unit, and a buffer storage addess area for storing addresses of the predetermined storage units coresponding to the storage areas. The buffer storage address area is divided into a plurality of addres area banks each interleaved by storage unit, and the buffer storage data area is divided into a plurality of data area banks each interleaved by an access width unit.

Abstract: In a storage system having a main storage and a buffer storage accessable by a plurality of requesters, the buffer storage comprises a buffer storage data area having a plurality of storage areas for storing a portion of data of the main storage as a copy of the main storage for each predetermined storage unit, and a buffer storage address area for storing addresses of the predetermined storage units corresponding to the storage areas. The buffer storage address area is divided into a plurality of address area banks each interleaved by storage unit, and the buffer storage data area is divided into a plurality of data area banks each interleaved by an access width unit.