A magnetic tape device includes: a magnetic head; a head actuator that holds the magnetic head; and a tape lifting mechanism including a lifter arm. The lifter arm comes into contact with the magnetic tape to separate a magnetic tape from the magnetic head. The tape lifting mechanism moves the lifter arm in a push-out direction in conjunction with the head actuator moving in a first direction. The tape lifting mechanism moves the lifter arm in a retreating direction in conjunction with the head actuator moving in a second direction. The lifter arm pushes out the magnetic tape to separate the magnetic tape from the magnetic head, in response to the lifter arm moving in the push-out direction. The lifter arm separates from the magnetic tape to bring the magnetic tape into contact with the magnetic head, in response to the lifter arm moving in the retreating direction.

A magnetic tape device includes: a magnetic head; a head actuator that holds the magnetic head; and a tape lifting mechanism including a lifter arm. The lifter arm comes into contact with the magnetic tape to separate a magnetic tape from the magnetic head. The tape lifting mechanism moves the lifter arm in a push-out direction in conjunction with the head actuator moving in a first direction. The tape lifting mechanism moves the lifter arm in a retreating direction in conjunction with the head actuator moving in a second direction. The lifter arm pushes out the magnetic tape to separate the magnetic tape from the magnetic head, in response to the lifter arm moving in the push-out direction. The lifter arm separates from the magnetic tape to bring the magnetic tape into contact with the magnetic head, in response to the lifter arm moving in the retreating direction.

A magnetic tape device includes: a magnetic head; a head actuator that holds the magnetic head; and a tape lifting mechanism including a lifter arm. The lifter arm comes into contact with the magnetic tape to separate a magnetic tape from the magnetic head. The tape lifting mechanism moves the lifter arm in a push-out direction in conjunction with the head actuator moving in a first direction. The tape lifting mechanism moves the lifter arm in a retreating direction in conjunction with the head actuator moving in a second direction. The lifter arm pushes out the magnetic tape to separate the magnetic tape from the magnetic head, in response to the lifter arm moving in the push-out direction. The lifter arm separates from the magnetic tape to bring the magnetic tape into contact with the magnetic head, in response to the lifter arm moving in the retreating direction.

An information processing apparatus includes a power controller configured to perform one of first control, which, in response to the information processing apparatus transitioning from a second power state to a first power state, supplies electric power to a storage device and drives a spindle motor, and second control, which, in response to the information processing apparatus transitioning from the second power state to the first power state, supplies electric power to the storage device without driving the spindle motor, wherein, when the information processing apparatus is in the second power state, the power controller performs the first control based on a state controller receiving a first request signal, and the power controller performs the second control based on the state controller receiving a second request signal different from the first request signal.

An information processing apparatus includes a power controller configured to perform one of first control, which, in response to the information processing apparatus transitioning from a second power state to a first power state, supplies electric power to a storage device and drives a spindle motor, and second control, which, in response to the information processing apparatus transitioning from the second power state to the first power state, supplies electric power to the storage device without driving the spindle motor, wherein, when the information processing apparatus is in the second power state, the power controller performs the first control based on a state controller receiving a first request signal, and the power controller performs the second control based on the state controller receiving a second request signal different from the first request signal.

Embodiments of the present invention provide a tape transport control system with enhanced regulation of tape tension and velocity over the entire length of the tape. The tape transport control system comprises of circuitry adapted to output and circuitry adapted to receive one or more signals representing a tape velocity, at least one radius of either the first tape reel or the second tape reel, and a tape tension, and based on the received signals, generate at least one control signal to control at least one of the first reel motor or the second reel motor so as to reduce a tension disturbance at a minimum, one frequency corresponding to a time-varying reel-rotation frequency, based on controller parameters that depend on the tape velocity and on the at least one radius of either the first tape reel or the second tape reel.

Embodiments of the present invention provide a tape transport control system with enhanced regulation of tape tension and velocity over the entire length of the tape. The tape transport control system comprises of circuitry adapted to output and circuitry adapted to receive one or more signals representing a tape velocity, at least one radius of either the first tape reel or the second tape reel, and a tape tension, and based on the received signals, generate at least one control signal to control at least one of the first reel motor or the second reel motor so as to reduce a tension disturbance at a minimum, one frequency corresponding to a time-varying reel-rotation frequency, based on controller parameters that depend on the tape velocity and on the at least one radius of either the first tape reel or the second tape reel.

A tape transport control system with enhanced regulation of tape tension and velocity over the entire length of the tape. For example, a closed-loop control system for controlling a tape transport includes circuitry adapted to output a signal representing a tape velocity at a tape head, circuitry adapted to output a signal representing a tape velocity at the first tape reel and a signal representing a tape velocity at the second tape reel, circuitry adapted to output a signal representing a tape tension, and circuitry adapted to, based on the received signals, generate control signals to control the tape velocity at least at one of the tape head, the first tape reel, the second tape reel, and the tension of the tape, using controller gains that depend on a longitudinal position of the tape, and to implement a system transfer function that is approximately independent of the longitudinal position.

A tape transport control system with enhanced regulation of tape tension and velocity over the entire length of the tape. For example, a closed-loop control system for controlling a tape transport includes circuitry adapted to output a signal representing a tape velocity at a tape head, circuitry adapted to output a signal representing a tape velocity at the first tape reel and a signal representing a tape velocity at the second tape reel, circuitry adapted to output a signal representing a tape tension, and circuitry adapted to, based on the received signals, generate control signals to control the tape velocity at least at one of the tape head, the first tape reel, the second tape reel, and the tension of the tape, using controller gains that depend on a longitudinal position of the tape, and to implement a system transfer function that is approximately independent of the longitudinal position.

A drive-implemented method according to one embodiment includes determining that unthreading of a tape is to be performed, and in response to the determination that the unthreading of the tape is to be performed, determining whether to write an index on the tape prior to unthreading the tape. In response to a determination to write the index on the tape, the index is written on the tape prior to unthreading the tape. The tape is then unthreaded. The drive-implemented method further includes receiving a write request after the unthreading, rethreading the tape, and writing data corresponding to the write request on the tape. The index stored on the tape prior to the unthreading is overwritten with the data corresponding to the write request.