6results about "Track selection/addressing details" patented technology

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.

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.

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.