Abstract: A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitized in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.

Abstract: A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting data bus to notify a disk control device 2 of a conversion result via an NRZ data bus. The disk control device 2 includes means for storing the result of the analog-to-digital conversion of said servo positional signal. The positional signal of a head of the disk device is digitalized in an R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.

Abstract: A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitalized in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.

Abstract: Defect management information of a disk apparatus is read efficiently. Pieces of defective track information, which each indicate existence of defective tracks for a group of a plurality of tracks, are stored being associated with physical track numbers. And, pieces of defect information on defective tracks are stored in predetermined groups. Further, pieces of pointer information that indicate start addresses of storage address for the above-mentioned predetermined groups are stored. When a processing means receives an instruction of read or write to a track of a storage medium, the processing means refers to a piece of defective track information based on the above-mentioned addresses. When existence of a defective track is indicated, the processing means refers to a piece of pointer information corresponding to the group relating to the referred piece of defective track information.

Abstract: A magnetic disk recording and reproducing apparatus comprising a unit for inserting an error correcting code related to control information into said control information on data; a recording control unit for recording in a plurality of sectors formed by dividing the recording area of a magnetic disk, each sector having an ID area for recording said control information and a data area, provided adjacent to and behind said ID area, for recording said data; and a error correcting unit for correcting said control information of said ID area by said error correcting code before data is read from said data area corresponding to said ID area or data is recorded in said data area corresponding to said ID area.

Abstract: A magnetic disk recording and reproducing apparatus comprising a unit for inserting an error correcting code related to control information into said control information on data; a recording control unit for recording in a plurality of sectors formed by dividing the recording area of a magnetic disk, each sector having an ID area for recording said control information and a data area, provided adjacent to and behind said ID area, for recording said data; and a error correcting unit for correcting said control information of said ID area by said error correcting code before data is read from said data area corresponding to said ID area or data is recorded in said data area corresponding to said ID area.

Abstract: A disk storage device includes a data transfer control device for transferring data from a higher rank device to a storage medium and transferring data from the storage medium to the higher rank device, an identification device having identification information for determining whether it should be permitted or inhibited to write data into a predetermined recording area of the storage medium, and a data transfer command device, responsive to a data recording command given by the higher rank device, to order the data transfer control device to write data into the storage medium according to the identification information of the identification device. In response to a data write command given to the storage medium by the higher rank device, the data transfer command device collates a state of the data write command with the identification information possessed by a predetermined sector of the storage medium.

Abstract: A disk drive apparatus mounting socket includes a socket portion which supports a disk drive apparatus, a lead portion which is connected to the disk drive apparatus supported by the socket portion, and a terminal unit which is electrically connected to the lead portion and to circuits on a board. A disk drive apparatus, which is connectable to an information processing unit, includes a connecting unit which connects the disk drive apparatus to the information processing unit, and an interface unit which controls the disk drive apparatus in response to a control signal, a data bus signal, and an address bus signal which are generated by the information processing unit and are inputted to the disk drive apparatus from the information processing unit via the connecting unit.

Abstract: A disk type recording and reproducing apparatus includes a disk type recording medium having a plurality of tracks and having stored on each of the plurality of tracks a position signal indicating positions on the tracks; a drive section for rotating the disk type recording medium; a dual head separately incorporating a reading head for reading from the disk type recording medium and a writing head for writing into the disk type recording medium; a head drive section for moving the dual head; means for controlling the head drive section by a controlled variable in compliance with a position signal read from the disk type recording medium using an object track and the reading head; and memory means for storing quantity information used to correct the controlled variable of the means for controlling the head drive section.

Abstract: A disk drive is mounted to a circuit board by directly connecting a disk drive apparatus with a circuit board by using a DIP, PLCC, QFP, or PGA mounting method. The disk drive apparatus has an interface for controlling a disk drive in response to a control signal, a data bus signal and an address bus signal outputted from an information processing unit so that the disk drive apparatus may be connected like a memory card of the information processing unit.

Abstract: A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitalizes in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.

Abstract: A disk type recording and reproducing apparatus includes a disk type recording medium, and a dual head including a reading head and a writing head. A center of the core of the reading head is shifted in the radial direction of the disk type recording medium relative to a center of the core of the writing head. The disk type recording medium has a plurality of recording tracks each having a plurality of sectors. Each of the sectors has an ID division provided ahead of a data division disposed in the circumferential direction of the disk type recording medium. The ID division has recorded therein identification information identifying the sector. A center line of the ID division is shifted in the radial direction of the disk type recording medium relative to a center line of the data division by a distance equal to a distance by which the center of the core of the reading head is shifted in the radial direction of the disk type recording medium relative to the center of the core of the writing head.

Abstract: An improved epilating device is capable of effectively removing the hairs at different skin portions of the human body. The epilating device includes a single housing which is shaped to be grasped by the hand of a user and which includes a drive source. The housing carries a first epilation module provided at its top with a first plucking head which is driven by the drive source to effect the plucking of the body hairs. The first plucking head has a length defining therealong a first epilation zone. Also carried on the housing is a second epilation module provided at its top with a second plucking head which is driven commonly by the drive source to effect plucking of the body hairs. The second plucking head has a length defining therealong a second epilation zone.

Abstract: A data processing apparatus suitable for fast processing of a large amount of data provides continuous and real-time reproduction of moving pictures that have a reality to them. In one embodiment, the data processing apparatus includes: a first memory for receiving and storing first transfer data supplied from an external device in a first transfer mode for transferring data in a predetermined cycle; a second memory for receiving and storing second transfer data supplied from the external device in a second transfer mode, the second transfer mode transfers the second transfer data using a remaining time resulting from exclusion of a time needed for transfer of the first transfer data from the predetermined cycle; a first interface for receiving the first transfer data read from the first memory and outputting the first transfer data; and a second interface for receiving the second transfer data read from the second memory and outputting the second transfer data.

Abstract: A small computer system interface device is capable of transmitting data between a central digital data processing device and an external device without the need for terminal resistors coupled between the SCSI and the central digital data processing device. A pair of data buses each containing equal number of data lines supply data to a protocol controller which identifies the number of data lines being used to transfer data and then transfers the supplied data to a disk drive unit using the full number of data lines provided by said pair of buses. When the number of bus lines used is less than that provided by both buses, the protocol controller signals a level setting circuit to set the number of bus lines unused by to transfer data from the central digital processing device inactive so as to allow the throughput of data between the digital processing device, SCSI and disk drive unit.

Abstract: Apparatus for recording and/or reproducing user data recorded on a record medium. The apparatus includes record encoder for converting original user data into encoded user data of a predetermined record code and an error correcting code generator for generating original error correcting code data for correcting an error with respect to the encoded user data. A write unit records the encoded user data and the error correcting code on the record medium. A read unit reads the recorded data and the reproduced data is error corrected so as to provide the original user data.

Abstract: A magnetic disk recording and reproducing apparatus including a unit for inserting an error correcting code relating to control information in the control information, the control information relating to data, a recording control unit for recording the control information and the data in a recording area of a magnetic disk, the recording area having a plurality of sectors, each of the sectors having an ID area for recording the control information and a data area for recording the data, the data area corresponding to the ID area and being provided adjacent to and behind the ID area in the same sector as the ID area, and an error correcting unit for correcting errors in the control information in the ID area using the error correcting code before the data in the data area corresponding to the ID area and provided in the same sector as the ID area is read or recorded.

Abstract: A hair trimmer for trimming hairs including a casing having an actuating device; a cutter head disposed at one end of the casing and including a generally elongated fixed blade and a movable blade adapted to be driven by the actuating device so as to reciprocate relative to the fixed blade in a cutting plane to trim the hairs; and a hair restraint edge for regulating a distance between the cutter head and the scalp to permit the hairs to extend across a space between the cutter head and the hair restraint edge in a substantially layer form of a thickness equal to the distance to the cutter head.

Abstract: A buffing apparatus which can buff a thin plate work without causing buckling. The buffing apparatus comprises a plurality of buffing rolls removably secured in a predetermined spaced relationship from each other to a shaft which is driven to rotate, a backup roll disposed in parallel to the buffing rolls and extending over the overall length of all of the buffing rolls, and a holding roll disposed at least between each adjacent ones of the buffing rolls. The holding roll is positioned such that the axis thereof is positioned on a straight line interconnecting the center of transverse section of one of the buffing rolls and the center of a transverse section of the backup roll and an outer periphery thereof substantially contacts with a contacting plane of the buffing rolls.

Abstract: A hair clipper has a cutter head on the front end of a housing. The cutter head includes a toothed stationary blade and a toothed movable blade reciprocating on the stationary blade in a hair shearing engagement between individual toothed edges thereof. The movable blade is slidable relative to the stationary blade in an edgewise direction perpendicular to the reciprocating motion of the movable blade for varying a cut length of hairs. An adjuster handle is slidably fitted on an outer round surface of the housing and linked to the movable blade through a linkage member such that the movable blade is shifted in the edgewise direction to increase and reduce the cut length by rotating the adjuster handle about a longitudinal axis of the housing. In addition, the hair clipper can be formed in such a structure that the reciprocating motion of the movable blade is turned on and off at the opposite ends of the rotation range of the adjuster handle.