12results about "Track selection/addressing details" patented technology

According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a magnetic element provided between the first and the second magnetic poles. The magnetic element includes first to fourth magnetic layers, and first to fifth non-magnetic layers. The fourth magnetic layer includes a first element and at least one of Fe, Co or Ni. The first element including at least one selected from the group consisting of Cr, V, Mn, Ti, N and Sc. The fourth non-magnetic layer including at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag. The fifth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag.

An electronic device for emulating an EEPROM includes: a flash ROM including a data block including a plurality of first sectors in which usage data is stored and a metadata block including a plurality of second sectors in which metadata on the usage data is stored, a virtual EEPROM emulated by the flash ROM, and a processor accessible to the flash ROM.

This disclosure relates to an electronic device for emulating an EEPROM and a method of operating the same, the electronic device comprising: a flash ROM consisting of data blocks and metadata blocks; a virtual EEPROM emulated by the flash ROM; and a processor capable of accessing the flash ROM; the data blocks comprising a plurality of first sectors in which usage data is stored, and the metadata blocks comprising a plurality of second sectors in which metadata on the usage data is stored.

Provided is a magnetic disk device capable of efficiently searching for commands. According to the present embodiment, a magnetic disk device includes a magnetic disk, a memory, and a controller. The disk includes a plurality of regions to which unique addresses are assigned, respectively. The memory stores a plurality of unprocessed commands. The controller stores a database of a tree-like structure in a memory. The configuration includes a plurality of nodes associated with each of a plurality of addresses specified by each of a plurality of unprocessed commands, and two of the plurality of nodes are associated with each other. The controller selects a candidate command from a command associated with an address larger than the start address and closest to the start address and a command associated with an address smaller than the start address and closest to the start address, the candidate command being a candidate to be executed next among the plurality of unprocessed commands.

A servo control system according to one embodiment of the present disclosure controls a servomotor, and comprises: a servo amplifier that supplies the servomotor with a pulse-width-modulated drive current, and that can change pulse frequencies; and a servo control device that gives the servo amplifier an instruction on the target speed or the target position of the servomotor and the pulse frequencies. The servo control device has: a target instruction unit that gives an instruction on the target speed or the target position; a power consumption calculation unit that calculates, on the basis of information on the servomotor and / or the servo amplifier, the total power consumption of the servomotor and the servo amplifier at each of a plurality of set frequencies set in advance as the pulse frequencies; and a frequency instruction unit that gives the servo amplifier an instruction to perform the pulse width modulation at a set frequency, among the plurality of set frequencies, at which the total power consumption becomes minimum.

A servo control system according to one embodiment of the present disclosure controls a servo motor, the servo control system comprising: a servo amplifier capable of changing a pulse frequency by supplying a pulse width modulated drive current to the servo motor; and a servo control device that commands the target speed or target position of the servo motor and the pulse frequency to the servo amplifier, the servo control device being provided with: a target command unit that commands the target speed or target position; a power consumption calculation unit that calculates the total power consumption of the servo motor and the servo amplifier for each of a plurality of set frequencies set in advance as the pulse frequency, on the basis of information about at least one of the servo motor and the servo amplifier; and a frequency command unit that commands the servo amplifier to perform the pulse width modulation at the setting frequency, among the plurality of setting frequencies, at which the total power consumption is minimum.

The embodiment of the invention provides a tape storage system and a control method. The tape storage system comprises a power supply interface, a power distribution module, a standby power supply and a tape reel motor, the power supply interface is connected with the power supply distribution module, a power supply link is arranged between the power supply distribution module and the tape winding disc motor, a charging link is arranged between the power supply distribution module and the standby power supply, and the power supply distribution module is used for controlling the power supply link and the charging link to be closed and opened. And the standby power supply is connected with the take-up reel motor through a switch.

To provide a magnetic disk device that can efficiently search for commands. [Solution] A magnetic disk device according to one embodiment includes a magnetic disk, memory, and a controller. The magnetic disk includes a plurality of areas, each with a unique address. The memory stores a plurality of pending commands. The controller stores a tree-structured database in memory. The structure includes a plurality of nodes, each associated with a plurality of addresses specified by each of the plurality of pending commands, and two of the plurality of nodes are associated with each other. The controller selects a candidate command to be executed next from among the plurality of pending commands from a command associated with an address greater than the start address and closest to the start address, and a command associated with an address less than the start address and closest to the start address.

A servo control system according to an embodiment of the present disclosure controls a servo motor and includes: a servo amplifier that supplies the servo motor with a pulse-width modulated drive current and that can change pulse frequencies; and a servo controller that gives the servo amplifier an instruction about the target speed or the target position of the servo motor and the pulse frequencies.The servo control device includes: a target command unit that gives a command about the target speed or the target position; a power consumption calculation unit that calculates, based on information about the servo motor and / or the servo amplifier, the total power consumption of the servo motor and the servo amplifier at each of a plurality of target frequencies set in advance as the pulse frequencies; and a frequency command unit that gives the servo amplifier a command to perform the pulse width modulation at a target frequency among the plurality of target frequencies at which the total power consumption becomes minimum.

Provided is a disk device excellent in reliability, capable of writing a plurality of reference patterns to a disk at appropriate intervals without intersecting each other, and a reference pattern writing method thereof. Deviation of a writing position of a spiral pattern is detected, a prescribed speed is successively corrected in a direction in which the deviation disappears, and each spiral pattern is written based on the corrected prescribed speed.

A magnetic disk includes areas to which unique addresses are respectively assigned. A memory is configured to store unprocessed commands. A controller is configured to store, in the memory, a database of a tree-shaped structure. The structure includes a plurality of nodes respectively associated with a plurality of addresses respectively specified by a plurality of unprocessed commands. Two of the plurality of nodes are associated with each other. The controller is further configured to select, of the plurality of unprocessed commands, either a command associated with an address larger than and closest to a start address or a command associated with an address smaller than and closest to the start address as a candidate command to be executed next.