Abstract: The power storage device includes power storage units arranged with a conductive plate interposed therebetween in the vertical direction, each of the power storage units includes an electrode stack including bipolar electrodes stacked with a separator interposed therebetween, and a sealing member provided around the electrode stack so as to seal a housing space formed between adjacent electrodes of the electrode stack. At least one of the power storage units is provided with an overhang member on an outer peripheral surface of the sealing member. The overhang member includes an inclined portion that extends from the outer peripheral surface of the sealing member toward the outside of the power storage unit and inclines downward as it leaves away from the outer peripheral surface of the sealing member, and a top portion formed at a lower end of the inclined portion.

Abstract: A seek control device for use in a floppy disk apparatus, for performing a reverse seek operation to detect the zero track position on a magnetic disk as a reference for moving the magnetic head to a destination track on the magnetic disk. The device includes a driving section for seeking the zero track position in response to an input reverse seek instruction and for seeking a destination track position in response to an input forward seek instruction, a track zero signal generating section for generating a track zero signal when the magnetic head is on the zero track, and a seek control section. The seek control section determines if a seek error has occurred, and in response, temporarily interrupts the input seek operation, generates forward drive instructions until the track zero detection signal has been turned off, generates a reverse drive instruction to the driving section in order to seek the zero track position, and then continues with the input seek operation.

Abstract: A floppy disk drive apparatus capable of using high- and low-density disks includes an erase section. When it is determined that a floppy disk to be used has a high-density, data is immediately written on the floppy disk in response to a write command. However, when it is determined that the floppy disk to be used has a low-density, data, which has previously been recorded on the recording area of the track where the read/write head is currently located, is erased prior to the writing of new data. After erasure is completed, the new data is recorded on the recording area, in response to a write signal.

Abstract: Disclosed is a self-compensating device for a magnetic disc apparatus with a velocity servo system in which an output signal of a velocity detector detects the velocity of a read/write transducer is automatically compensated by the combination of a control means and a compensator. While supplying a given velocity command signal to the velocity servo system, the control means measures the velocity of the transducer by using a track detector and adjusts the compensator on the basis of the result of the measurement.

Abstract: Disclosed is a self-compensating device for a magnetic disc apparatus with a velocity servo system in which a change of the characteristic of an actuator for positioning a read/write transducer is automatically compensated by the combination of a control means and a compensator. While supplying a given velocity command signal to the velocity servo system, the control means measures the motion of the transducer by using a track detector and adjusts the compensator on the basis of the result of the measurement.

Abstract: A servo track apparatus comprising at least one unit pattern area including 2n (n=2, 3, 4, . . . ) servo tracks T.sub.i (i=0, 1, . . . 2n-1) and 2n.sup.2 flux transitions R.sub.jk (j=0, 1, . . . 2n-1; k=0, 1, . . . n-1). The tracks and flux transitions satisfy a condition TT requiring that track T.sub.p be adjacent to track T.sub.p+1 ; a condition TR requiring that transition R.sub.pq occur on track T.sub.p+q (mod 2n); a condition RR requiring that transitions R.sub.pq and R.sub.pr (r.noteq.q) have the same polarity and occur at the same position; and a condition RR requiring that transitions R.sub.pr and R.sub.qr (q.noteq.p) occur at different positions.