Abstract: A disk drive apparatus that performs a positioning of a head based on servo information recorded on a recording medium includes a servo control unit that performs a servo control based on a set of pieces of servo information selected from a plurality of sets of pieces of servo information recorded on the recording medium.

Abstract: A head is moved in a lateral direction on the boundary between a separation track and a recording track on a recording medium. The separation track isolates the adjacent recording tracks from each other. A variation is detected in the output supplied from the head based on the recording track. Positional information indicating the position of the head is generated based on the variation. The output supplied from the head varies in response to the movement in the lateral direction, namely the elapsed time. The positional information can thus be generated based on the variation in the output. The generated positional information contributes to an accurate positioning in a facilitated manner. Moreover, information required to position the head can be omitted from the recording medium. The processes can be simplified in the production of the recording medium. The operation time can thus be shortened.

Abstract: A network system which facilitates the task of replacing switches pertaining to a detected link failure. A server network is formed from a plurality of switches and links. The link state of each port on the switches is being monitored by a link-down detector, and a switch port that has entered a link-down state from a link-up state is identified as an inoperative port. Upon detection of such a link-down event, a function disabler disables link functions of specified ports of other switches in the switch group to which the switch having the inoperative port belongs, so that the servers on the network will change their setups all at once and continue the communication through new paths.

Abstract: There are connected a plurality of hosts 1 to L, a plurality of targets 1 to M and a plurality of initiators 1 to N, through a network. Each target has a managing unit which decides by itself the target search information broadcast from the initiator onto the network. In the case it is suited for data storage in the own target, data storage response information containing accepted priority information is broadcast onto the network. The target largest in priority value is notified of target selection from the initiator, thus effecting data storage.

Abstract: A magnetic head supporting mechanism includes a fixing member, a piezoelectric element supported by the fixing member, and a head supporting member provided on the piezoelectric element, a magnetic head being supported by the head supporting member. An acceleration sensor is formed by the head supporting member and the piezoelectric element so as to be incorporated into the mechanism.

Abstract: A disk drive apparatus that performs a positioning of a head based on servo information recorded on a recording medium includes a servo control unit that performs a servo control based on a set of pieces of servo information selected from a plurality of sets of pieces of servo information recorded on the recording medium.

Abstract: A magnetic pattern transfer method is disclosed. A magnetic pattern transfer master having a plurality of magnetic portions preformed with predetermined magnetic patterns is brought in proximity to a magnetic recording medium having a magnetic film to record the magnetic information, and a magnetic field is applied from an external source thereby to transfer the magnetic patterns to the magnetic recording medium. In order to improve the closeness between the magnetic film of the magnetic recording medium and the magnetic portions of the magnetic pattern transfer master, the magnetic patterns are transferred to the magnetic film of the magnetic recording medium during the process of fabricating the magnetic recording medium.

Abstract: The present invention relates to a system capable of carrying out efficient and stable system operation control even if a usage rate of the entire system varies under a situation in which the characteristics of storage units, such as maximum available total capacity and speed performance, are largely different from each other. Therefore, the system according to the present invention is composed of a monitor unit for monitoring information on a total volume of data stored in each of the storage units or in all the storage units, an index value calculating unit for calculating an index value on the basis of the monitor result and a location unit for distributively locating or relocating logical storage areas in physical storage areas on a plurality of storage units on the basis of the calculated index value.

Abstract: A magnetic head supporting mechanism includes a fixing member, a piezoelectric element supported by the fixing member, and a head supporting member provided on the piezoelectric element, a magnetic head being supported by the head supporting member. An acceleration sensor is formed by the head supporting member and the piezoelectric element so as to be incorporated into the mechanism.

Abstract: In an automatic wiring connection apparatus, position detection marks 221; 231 are disposed on matrix boards 220; 230, respectively, as shown in FIG. 8. Position data of a desired crosspoint hole included in anyone of areas 227.sub.-- 1, . . . , 227.sub.-- 5; 237.sub.-- 1, . . . , 237.sub.-- 4 as assembly of crosspoint holes is corrected in accordance with a difference between design values of the position detection marks 221; 231 and measured values. A pin insertion and pulling out robot is operated in accordance with the corrected position data.