Abstract: A drop sensor detects a drop of a device. When the drop of the device is detected, a sub CPU allows a counter to count a drop time. When the device drops for a predetermined time or more, the sub CPU controls a regulator so that the regulator forcibly disconnects an electric power to be supplied to a hard disc, and writes a drop occurrence flag into a nonvolatile memory. When the power supply is again turned on, a main CPU allows a display section to display information indicating that the power supply is disconnected due to the drop of the device.

Abstract: A defect is detected on a storage medium of a disk drive. A location of the defect is determined, within a smallest addressable unit of data stored on the storage medium. An indication of the location is stored in a memory. A location of a sensor of the disk drive relative to the data stored on the storage medium is monitored. A response of at least one of a defect detector of the disk drive, a read channel controller of the disk drive, and a servo controller of the disk drive is changed based on the location of the sensor relative to the data stored on the storage medium and the stored indication of the location of the defect.

Abstract: A tape library control apparatus includes a storage for storing configuration information, a diagnostic evaluator, and a command controller. A tape library apparatus includes may include a plurality of tape drives and a plurality of magnetic tapes which includes specific magnetic tapes assigned for respective pieces of data specified by each data request issued by a host computer and a common magnetic tape provided for writing the respective pieces of the data. The diagnostic evaluator determines a use mode of the tape library apparatus on the basis of the configuration information. When the total number of the specific magnetic tapes is higher than the number of available tape drives, the use mode is determined and a command is issued to the tape library apparatus from the command controller to write data to the specific magnetic tape and to write to the common magnetic tape the respective pieces of the data.

Abstract: According to one embodiment, a magnetic recording tape includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars having an average height of between about 80 microns and about 120 microns, wherein an average stripe angle of the bars is between about 10° and about 25°. A stripe angle is measured between a longitudinal axis of each respective bar and a line oriented perpendicular to a direction of tape travel and parallel to a plane of the tape, wherein an average stripe width of the bars is between about 1.0 micron and about 2.2 microns and an average servo frame length of groups of the bars comprising a servo frame is between about 120 microns and about 180 microns. In more embodiments, a servo format and a system including a servo format are disclosed, along with other embodiments of magnetic tapes.

Abstract: An external storage device includes a media control section (10), a monitoring section (20), an interface section (30) and a power control section (40). The media control section (10) drives a recording media and performs data access to the recording media. The monitoring section (20) monitors whether the data access by the media control section (10) can be performed or not. The interface section (30) performs communication with a host device. When the monitoring section (20) detects that the data access can not be performed, the power control section (40) limits power supply to the interface section (30). When the monitoring section (20) detects that the data access can be performed, the power control section (40) re-starts the power supply.

Abstract: An information storing device and an information processing device having a memory for registering a plurality of working modes at recording/reproduction and a switching circuit for selecting one of the plurality of working modes, which select the optimum working mode automatically or by an instruction of an operator according to power supply capacity of a device of higher rank to effect recording/reproduction.

Abstract: A hard disk drive (HDD) comprising a magnetic disk that includes a data storage surface and an external magnetic field parallel to the data storage surface for suppressing track interference.

Abstract: A magnetic racetrack memory device includes; a magnetic track having a plurality of magnetic domains partitioned by at least one magnetic domain wall, a current source applying current to the magnetic track sufficient to move the at least one magnetic domain wall and the plurality of magnetic domains along the magnetic track, a writing device disposed at a first location along the magnetic track and storing write data to the magnetic domains, a reading device disposed at a second location along the magnetic track and retrieving read data from the magnetic domains, and a write-back loop connecting the reading device and the writing device and communicating read data obtained by the reading device to the writing device.

Abstract: A technique for rate verification of an incoming serial alignment sequence includes receiving an incoming serial stream. A determination is then made as to whether an align sequence is recognized in the incoming serial stream. When an align sequence is recognized, a check is made to determine if an appropriate number of align primitives are received during a predetermined number of clock periods. If the number of received align primitives matches the predetermined number, then a rate-verified align detect signal is asserted.

Abstract: An apparatus, system, and method are disclosed for automatically and transparently mapping tape drives within tape libraries to IP addresses. In one embodiment, the tape library includes, a DHCP server, a LAN to serial switch, and a library manager configured with the necessary modules to map the tape library devices to the proper IP addresses. The entire process may be transparent to users. The result is that the tape library is configured with the proper IP addressing without costly, time-consuming, and error-prone manual intervention. The tape library can be configured more quickly with accurate IP addressing and is able to operate efficiently and properly.

Abstract: A storage apparatus comprises at least one housing A in which a storage device and a controller are provided, at least one housing B in which a storage device and a peripheral device are provided, and a transmission path for connecting the storage device and the controller of the housing A, and the storage device of the housing B to enable communication therebetween. The storage apparatus is capable of controlling operation of the storage device of the housing B according to an operating state of the storage device of the housing A through communication via the transmission path; and controlling operation of the peripheral device according to an operating state of the storage device of the housing B.

Abstract: A servo write method for a hard-disk drive. The method includes generating, with an input of characteristics of a magnetic-recording head and a magnetic-recording disk which are incorporated into the hard-disk drive, a yield prediction model from a correlation between yields of the hard-disk drive, and characteristics of the magnetic-recording head and the magnetic-recording disk of the hard-disk drive in a process. The method also includes predicting a yield which is obtained when each magnetic-recording head is used as a position control head, selecting as the position control head a magnetic-recording head that has a highest predicted yield, and writing a servo signal.

Abstract: A data recording apparatus recording data of a CD on an HDD in a manner such that the content of record in the CD is faithfully accounted for and shortening an operation time for a synchronized ripping operation. When the data recording apparatus reads, from the CD, track data managed by track, according to TOC, and records the track data onto the HDD, the data recording apparatus recognizes data unrecorded on the HDD, from among the track data recorded on the CD. This recognition process is automatically performed based on the TOC read from the CD, and album information replayed using the TOC and held by the HDD. The recording apparatus reproduces and outputs only the unrecorded data from the CD based on the recognition result concerning the unrecorded data. In this way, the data already recorded on the HDD is not transferred from the CD to the HDD. The operation time for the synchronized ripping operation is reduced accordingly.

Abstract: A storage medium on which servo patterns are encoded to provide lateral and longitudinal position (LPOS) information is provided. Each of the servo patterns includes a servo frame, including first through fourth bursts, which are each independently modulated with multi-level pulse position modulation (PPM) to encode at least one independent bit per burst.

Abstract: A technique for rate verification of an incoming serial alignment sequence includes receiving an incoming serial stream. A determination is then made as to whether an align sequence is recognized in the incoming serial stream. When an align sequence is recognized, a check is made to determine if an appropriate number of align primitives are received during a predetermined number of clock periods. If the number of received align primitives matches the predetermined number, then a rate-verified align detect signal is asserted.

Abstract: A control portion instructs supply of an offset voltage while a disk remains stopped at the time of start. While the disk remains stopped at the time of start, a differential operational amplifier detects a voltage difference between a first voltage supply line and a second voltage supply line. When the absolute value of the voltage difference output by the differential operational amplifier is equal to or lower than a prescribed threshold value, a failure determination portion determines that a spindle motor has shorted out.

Abstract: Drive circuitry for driving a load through a connection to a transmission line, such as for driving the write head of a hard disk drive. A hybrid termination is provided for termination at the connection to the transmission line. The termination is hybrid since there is both an in-series and an in-parallel component to the termination resistance. In addition, in embodiments where there is matched termination of the transmission line during a boost period of driving the load, the termination is hybrid since the termination is switched between a boost period of a write operation, and a steady state period of the write operation.

Abstract: A magnetic disk apparatus includes a computing unit that obtains data to be recorded on a magnetic disk and computes an intermediate bit length based on a longest bit length and a shortest bit length of bit lengths of the obtained data; an adjusting unit that adjusts a strength of a recording current for recording the obtained data based on a difference between the intermediate bit length and a bit length of the obtained data; and a recording unit that repeatedly detects an error rate for recording data by using the adjusted recording current while narrowing down a track width on the magnetic disk and records the obtained data with a track width corresponding to an error rate detected immediately before an error rate that is detected to be equal to or greater than a predetermined value.

Abstract: A portable data exchange device including a storage memory for storing data, a USB interface, and a device controller having a file-selection-and-transfer mechanism is disclosed. Upon coupling of the presently disclosed data exchange device with a USB flash drive (UFD), the file-selection-and-transfer mechanism is operative to automatically select for transfer a set of files residing in the data exchange device and/or the UFD, and to effect an inter-device file transfer between the data exchange device and the UFD of only the selected files. In exemplary embodiments, the data exchange device has at most a minimal user interface, no video display, and only one or two data ports. Optionally, the presently disclosed data exchange device automatically modifies names of files copied from the USB flash drive to the data exchange device in accordance with an identity of the source USB flash drive.

Abstract: An in-vehicle device includes: a communication element; a coupling element for coupling and decoupling between the in-vehicle device and a cell phone via the communication element; a hard disk drive for storing a telephone directory data; an incoming call notification element for notifying a passenger about an incoming call, accessing the telephone directory data, and notifying individual information of a caller; a high altitude decision element for deciding whether the vehicle is disposed in a high altitude area; and a switching element for setting the hard disk drive in an off-mode when the vehicle enters into the high altitude area, and for setting the hard disk drive in an on-mode when the vehicle passes through the high altitude area. The incoming call notification element stops notifying the incoming call and the individual information when the hard disk drive is in the off-mode.

Abstract: A disk drive including a delay circuit to provide a delayed reset signal is disclosed. The disk drive includes a head to perform write and read operations to and from a disk and a disk controller that is coupled to the head to control the write and read operations performed by the head. The disk drive further includes: a power loss detection circuit to detect a power loss and to generate a reset signal in response to the power loss; a reset power line coupled to the disk controller and the power loss detection circuit to provide a non-delayed reset signal to the disk controller; and a delay circuit coupled to the reset power line wherein the delay circuit delays the reset signal to provide a delayed reset signal.

Abstract: A data recording apparatus recording data of a CD on an HDD in a manner such that the content of record in the CD is faithfully accounted for and shortening an operation time for a synchronized ripping operation. When the data recording apparatus reads, from the CD, track data managed by track, according to TOC, and records the track data onto the HDD, the data recording apparatus recognizes data unrecorded on the HDD, from among the track data recorded on the CD. This recognition process is automatically performed based on the TOC read from the CD, and album information replayed using the TOC and held by the HDD. The recording apparatus reproduces and outputs only the unrecorded data from the CD based on the recognition result concerning the unrecorded data. In this way, the data already recorded on the HDD is not transferred from the CD to the HDD. The operation time for the synchronized ripping operation is reduced accordingly.

Abstract: A controller and a method for interfacing with a storage medium. Access to a buffer memory via a multi-channel bus is arbitrated. DWFT (Data Wedge Format Table) entries stored in the buffer memory are read and cached in a DWFT cache memory. Data is transferred to and from the storage medium through a storage medium interface. The storage medium interface accesses the sectors of the storage medium based on their physical locations, as defined by the cached DWFT entries. The multi-channel bus includes a DWFT channel to which DWFT cache circuitry is connected. In a DWFT tenure, the DWFT cache circuitry reads the DWFT entries stored in the buffer memory, and caches the DWFT entries in the DWFT cache memory.

Abstract: A computer implemented method of writing data to a linear tape is provided and includes, of the data to be written to the linear tape, distinguishing between data and meta-information, writing both the distinguished meta-information and undistinguished meta-information to a data area of the linear tape and the distinguished meta-information to a reserved area at a leading end of the linear tape, and retaining information reflective of the meta-information and a location thereof in a specified position of the reserved area.

Abstract: A recording control device records a program to be reserved for recording on the basis of reservation information including recording start time information indicating a time, at which recording starts, and recording end time information indicating a time, at which recording ends. The recording control device includes a setting unit that, when it is judged that the program is not recorded after recording is reserved, sets the same time as the time, indicated by the recording start time information, at which recording starts, in the recording end time information of the reservation information for recording the program; and a recording control unit that, when the time, indicated by the recording start time information, at which recording starts, is the same as the time, indicated by the recording end time information, at which recording ends, controls recording of the program such that recording of the program is suppressed.

Abstract: A media storage system includes a disc input element for receiving a media disc, a disc output element for ejecting a disc, and a media reader for reading information from a disc. If insufficient information is readable from a disc, it may be obtained through a computer network. The system includes a disc transporter for moving received discs to respective internal storage locations. The system includes a data input device for entering disc catalogue data and a data output device such as a display for displaying disc catalogue data. The data input and output devices may be input buttons and a display on a remote control. Each disc and related information is associated with an identifier such that access to disc data may be by restricted by user identifier or content ratings.

Abstract: Embodiments in accordance with the present invention provide a disk storage device and a control method for the disk storage device, which are capable of precluding an off-track write resulted from stick-slip caused by thermal distortion. A magnetic disk device is provided with a magnetic disk, a head that makes a writing to the magnetic disk, and a temperature sensor that detects the temperature inside of the magnetic disk device. Moreover, the magnetic disk device 1 changes determination requirements for use to make a determination whether or not to prohibit the writing by the head to the magnetic disk based on a measurement temperature detected by the temperature sensor and an amount of temperature change calculated using the measurement temperature.

Abstract: A data storage drive comprises a storage disk, a read/write head, and signal processing circuitry in signal communication with the read/write head. The read/write head is operative to read data from and write data to the storage disk at a plurality of data transfer rates. Moreover, the signal processing circuitry is powered by a variable power source. The variable power source varies supply voltage to the signal processing circuitry as a function of a current one of the data transfer rates of the read/write head. Power consumption is reduced in this manner.

Abstract: A magnetic tape driving apparatus includes a magnetic head (2), a temperature/humidity sensor (4), a Peltier element (11), and a controller (15). The temperature/humidity sensor (4) that detects the temperature and humidity of the magnetic head (2) or in the vicinity thereof. The Peltier element (11) that cools the magnetic head (2) and in the vicinity thereof based on detection results of the temperature/humidity sensor (4). The controller (15) that controls the Peltier element (11)based on the temperature and humidity information obtained by the temperature/humidity sensor (4). The controller ( 15) controls the Peltier element (11) so as to decrease the temperature of the magnetic head (2) and in the vicinity thereof when the humidity of the magnetic head (2) or in the vicinity thereof that the temperature/humidity sensor (4) detects is less than a predetermined value. By adopting this sort of configuration, it is possible to suppress an increase in error rate even in a low humidity environment.

Abstract: A hard disk drive is disclosed and related methods of reading/writing data are disclosed. The hard disk drive includes a disk serving as a main data storage medium, and first and second buffers storing data to be stored on the disk, as well as a controller defining a data I/O path in relation to a detected operating state of the hard disk drive.

Abstract: The provision of verification for data storage cartridges having data storage tape media employs determining the volume identity of a data storage cartridge; and providing an internal label at each block of data to be written to the data storage tape media of the data storage cartridge, the internal label at least comprising the volume identity. Verification of a label comprises reading an external label of the cartridge, the external label at least comprising a volume identity of the cartridge; determining whether the tape media comprises valid data arranged in blocks; positioning the tape media at one of the data blocks and attempting to read an internal label from the data block; and if so, determining whether the volume identity of the external label matches the volume identity of the internal label, and, if so, determining that the matching volume identity is the volume identity of the cartridge.

Abstract: A data storage system with a controller that receives shock data from a shock detection sensor and methods utilizing such a controller are provided. The data storage system controller receives information or signals regarding shock events from a shock sensor, enabling the data storage system controller to take remedial action. The particular remedial action taken may be dependent on the severity of the detected shock event. The data storage system controller may receive information regarding shock events from shock sensors provided separately from the data storage system controller, allowing the data storage system controller to take remedial action that is tailored to the locale of a shock event.

Abstract: Access to the physical disks is differentiated as access from a host computer, and access based on processing (data migration processing, copy processing) for storage management. Whether to switch the state of the physical disks from a normal power consumption mode to a power saving mode is determined according to the access from the host computer after the access based on processing for storage management is complete, and the state of the physical disks are switched from the normal power consumption mode to the power saving mode based on the determination result.

Abstract: A storage medium driving apparatus includes a head slider opposed to a storage medium, an acceleration detector detecting an acceleration of the apparatus. A control circuit retracts the head slider from above the storage medium according to a result detected by the acceleration detector and selectively executes one or more operations from among a plurality kinds of operations according to an index that is derived from the result detected by the acceleration detector and represents an amount of an impact energy.

Abstract: The power required by a voice coil motor (VCM) to maintain the head in the data region of a disk drive during an idle mode is further reduced. The current supplied to the VCM is switched on and off. This takes advantage of the inherent inductance in the VCM, which maintains a current after the current supply is switched off. The current will slowly decay, with it being switched on again before it reaches a level where the average value won't offset the flex bias. In one embodiment, the current is maintained in a single direction, to offset the flex bias which pushes in one direction. Digital switches are used to reduce the power consumption of the control circuitry.

Abstract: A driver for a motor in a device includes a reference generator to generate a reference value. A clock management module receives a plurality of clock signals. Each clock signal has a corresponding frequency that is different relative to the corresponding frequency of another clock signal. A clock management module selects a different clock signal of the plurality of clock signals for output from the clock management module at different times during operation of the device. A ramp generating module generates a ramp signal in accordance with the corresponding frequency associated with the selected clock signal. A first pulse width modulation module receives the reference signal and the ramp signal. The first pulse width modulation module outputs a first pulse width modulation driver signal for driving the motor based on the reference signal and the ramp signal.

Abstract: A difference value between a gain control value when a head comes into contact with a recording medium and a gain control value when the head floats with respect to the recording medium by a target floating amount is stored in advance. When the information access device is actually operated, supply power to a heater is adjusted to once bring the head into contact with the recording medium, a first gain control value adjusted by a gain control section when the head comes into contact with the recording medium is obtained, a second gain control value to be adjusted by the gain control section when the head floats from the recording medium by the target floating amount is obtained from the first gain control value and the difference value, and the supply power to the heater is adjusted such that the second gain control value is supplied to a gain variable amplifier by the gain control section.

Abstract: The storage control device of the present invention switch-connects each of enclosures and individually stops the transmission of power to the enclosures that are not being accessed in order to reduce the power consumption amount. A plurality of additional enclosures are switch-connected via an inter-device switch to a base enclosure. Drives that have not been accessed for a predetermined period of time or more undergo spindown. If all the drives in the enclosure then assume the spindown state, the supply of power to each of the drives from the intra-enclosure power supply is stopped. In cases where all the drives in a certain enclosure have undergone spindown, the base enclosure turns OFF the switch in the power distribution circuit connected to this enclosure. As a result, the transmission of power to this enclosure is stopped. The fault diagnosis section detects a fault that has occurred with communications that employ the inter-device switch and specifies the point of the fault occurrence.

Abstract: For an apparatus determining whether or not an HDD is started by barometric pressure information or the like, there are provided a navigation apparatus, an operation control device, an operation control method, and an operation control program, that enable shortening of a time from a power-on to starting-up of the HDD. The present application is the operation control device which controls the operation of the HDD by giving an instruction to the HDD to control the operation of the HDD, the operation control device including: a recording means for recording a previous closing information indicative of whether or not the operation of the operation control device normally ends by a previous power-off and an operation control means for giving an instruction of starting the operation to the HDD in a case where the operation has been normally ended at a time of starting the operation control device by the power-on.

Abstract: A disc apparatus which can judge accurately whether or not a spindle motor is at fault due to a short circuit is provided. A disc apparatus (1) includes a spindle motor (3) which rotates a disc (2), a differential operational amplifier (5) which successively detects output voltages of the spindle motor (3), and a failure judgment unit (10) which calculates an average voltage of the plural output voltages and judges whether or not the spindle motor (3) is at fault in accordance with the average voltage and the output voltages. When counting number of occurrences of a specific state which indicates that one of the two output voltages detected successively is larger than the average voltage and other of the two output voltages is smaller than the average voltage, the failure judgment unit (10) judges that the spindle motor (3) is at fault.

Abstract: A recording and reproducing apparatus including a reproduction unit configured to reproduce information data, which is error-correcting-coded for every N tracks, from a recording medium, wherein the information data includes moving image data which is variable-length-encoded, a recording unit configured to record moving image data on the recording medium, a detection unit configured to detect additional information from the information data reproduced by the reproduction unit, wherein the additional information indicates that the editing point, which can be set up for every frame of a predetermined number, is contained in the moving image data recorded in the N tracks, and a controller configured to control the reproduction unit to reproduce the information data by transporting the recording medium at a high-speed faster than a normal reproduction speed.

Abstract: In a method of implementing power savings in an automated storage system, a power savings mode authorization is sent from a library controller to a tape drive, such that the tape drive is authorized to enter an extended power savings mode that maintains an operational host interface in the tape drive for communicating with a host system. A media move command is received at a tape library of the automated storage system. The media move command comprises a command from the host system for the tape library to move a tape cartridge to the tape drive. In response to receiving the media move command, an instruction is issued to the tape drive to transition from the extended power savings mode to an active power mode. The instruction is issued prior to notifying the host system of completion of the media move command.

Abstract: A method and an apparatus for improving performance of a hard disk drive at low temperature are provided. The method includes: measuring an internal temperature of the hard disk drive; checking whether a measured internal temperature is not more than a predetermined critical temperature; if the measured internal temperature is not more than the predetermined critical temperature, driving a motor of the hard disk drive for a predetermined time and proceeding to the operation of the measuring of the internal temperature of the hard disk drive; and if the measured internal temperature is greater than the predetermined critical temperature, determining that reading/writing operations with respect to the hard disk drive are available.

Abstract: A tape cartridge management system which includes a plurality of tape cartridges, an RFID tag for storing management information being arranged at outside or inside of a case of the tape cartridges, and a reader-writer for reading and writing the management information stored in the RFID tag, the reader-writer being configured to be capable of reading and writing the management information with an identical positional relation against the plurality of the tape cartridges, wherein the tape cartridges for arranging the RFID tag at the outside of the case is provided with the RFID tag on an external surface of a side wall on which a label pasting member of the case is disposed, and wherein the tape cartridges for arranging the RFID tag at the inside of the case is provided with the RFID tag on an internal surface of the side wall on which the label pasting member of the case is disposed.

Abstract: A method and system for providing a disk drive is described. The disk drive includes media such as one or more disks, a slider, and a head residing on the slider. The head has an air-bearing surface (ABS), a portion of which contacts the media during touchdown. The head further includes a plurality of touchdown sensors. A first touchdown sensor is proximate to the ABS, while a second touchdown sensor is distal from the ABS. The touchdown sensors are capable of detecting a temperature change of 0.1 degree Celsius or, in some embodiments, smaller.

Abstract: An optical disk contains main video data obtained by compressing pictures captured by a video camera at a relatively low compression ratio, low resolution proxy video data obtained by performing compression at a compression ratio higher than that for the main video data, metadata for use in editing. When a state in which the optical disk 2 is loaded into a drive of an optical disk apparatus is detected, the proxy video data and the metadata are read and recorded in a hard disk drive (HDD) without receiving a user's instruction. The proxy video data and metadata recorded in the HDD are used in simple editing before main editing in which the main video data is edited.

Abstract: A method and system for providing a disk drive is described. The disk drive includes media such as one or more disks, a slider and a head residing on the slider. The head has an air-bearing surface (ABS) and includes a touchdown sensor proximate to the ABS. The touchdown sensor is capable of detecting a temperature change of 0.1 degree Celsius or, in some embodiments, smaller. The disk drive also includes touchdown sensor control circuitry coupled with the touchdown sensor. The touchdown sensor control circuitry drives a current through the touchdown sensor and converts a signal from the touchdown sensor into an indication of whether touchdown has occurred.

Abstract: According to one embodiment, a recording medium drive includes a housing, a recording medium, a head actuator member stored in the housing reciprocatably about a shaft, and facing the recording medium at one end, a load tab on the end of the head actuator member, a ramp member fixed in the housing at an outer side of the recording medium, and defining a sliding surface that receives sliding of the load tab, a heater increasing a temperature of the ramp member based on a supplied driving current, a temperature sensor detecting a temperature inside the housing and outputting temperature information, a memory storing profiles of the driving current each set for a predetermined temperature range, and a control circuit supplying a predetermined value of driving current to the heater based on one of the profiles corresponding to the temperature information.

Abstract: A memory device is comprised of a magnetic structure that stores information in a plurality of domains of the magnetic structure. A write unit writes information to at least one of the plurality of domains of the magnetic structure by applying a write current to the magnetic structure in response to a control signal. A read unit reads information from at least one of the plurality of domains of the magnetic structure by applying a read current to the magnetic structure in response to the control signal. A domain wall movement control unit is coupled to a portion of the magnetic structure and moves information stored in the plurality of domains in the magnetic structure to other domains in the magnetic structure in response to the control signal. The write unit, the read unit and the domain wall movement control unit are all coupled to the same control signal line that provides the control signal.

Abstract: A magnetic recording medium has data track patterns formed by concave/convex patterns in data recording regions on at least one surface of a substrate and servo patterns formed by concave/convex patterns in servo pattern regions between the data recording regions. The concave/convex patterns include convexes, at least protruding end portions of which are formed of magnetic material, and concaves. A burst pattern region of each servo pattern region includes N (where N is at least two) burst regions, in which burst patterns, where plural burst signal unitary parts are aligned along a direction of rotation, are formed as the servo patterns. The burst signal unitary parts formed in M (where M is no greater than (N?1)) out of the N burst regions are concaves, and the burst signal unitary parts formed in L (where L is equal to (N?M)) out of the N burst regions are convexes.