29results about "Erasing method" patented technology

To provide a magnetic disk device capable of predicting whether error correction to a data track of a disk reaches a limit or not.SOLUTION: A magnetic disk device 1 includes a first disk having a first data track and a second data track, a first write head, a write processing unit, an error correction unit, a correction limit prediction unit 65, and a determination unit. During the write period, the correction limit prediction unit 65 calculates the excess amount OVR, calculates the metric value Mer by multiplying the excess amount OVR by the first weighting factor, updates the cumulative metric value ME, and generates the first prediction information. The determination unit determines whether to cause the write processing unit to continue the write processing on the second data track based on the first prediction information.SELECTED DRAWING: Figure 18

To provide a magnetic recording device that can improve productivity and a manufacturing method thereof.SOLUTION: According to the embodiment, a magnetic recording device includes a magnetic recording medium, a magnetic head, and a control unit. The magnetic head includes a coil, a first magnetic pole, and a light-emission unit. The control unit performs a first operation and a second operation. In the first operation, the control unit records first servo position information to a first area of the magnetic recording medium. In the second operation, the control unit executes a repair operation when a first condition is not fulfilled. The first condition includes that the recording condition of the first servo position information is within a first range. In the repair operation, the control unit performs an erase operation for irradiating light from the light-emission unit to the first area, and performs a re-record operation for recording the first servo position information to the first area after the erase operation again.SELECTED DRAWING: Figure 1

Provided are a magnetic recording device capable of improving productivity and a method for manufacturing the same. According to one embodiment, a magnetic recording apparatus includes a magnetic recording medium, a magnetic head, and a control unit. The magnetic head includes a coil, a first magnetic pole, and a light emitting portion. The control unit performs a first operation and a second operation. In the first operation, the control unit records first servo position information in a first region of the magnetic recording medium. In the second operation, if the first condition is not satisfied, the control unit performs the repair operation. The first condition includes that a recording condition of the first servo position information is within a first range. In the repair operation, the control unit performs an erasing operation in which the light is irradiated from the light emission unit to the first region, and performs a re-recording operation in which the first servo position information is re-recorded in the first region after the erasing operation.

Write commands in a shingled magnetic recording (SMR) drive are efficiently executed when a write command and associated write data are received by an SMR HDD from a host while the target SMR band for storing the write data is undergoing a refresh operation. In response to the write command, the HDD suspends the refresh operation, stores the write data in nonvolatile memory, and informs the host that the write command has been completed. After the write data are stored in nonvolatile memory, the HDD resumes the refresh operation, and the remaining unrefreshed data in the target SMR band are refreshed by being rewritten to the spare SMR band. The nonvolatile memory can include the spare SMR band in some instances, the target SMR band in some instances, and in both the spare SMR band and the target SMR band in some instances.

According to one embodiment, a magnetic disk device includes a first disk having a first data track and a second data track, a first write head, a write processing unit, an error correction unit, a correction limit prediction unit, and a determination unit. During a write period, the correction limit prediction unit calculates an excess amount, calculates a metric value by multiplying a first weight coefficient by the excess amount, updates a cumulative metric value, and generates first prediction information. The determination unit determines whether or not to allow the write processing unit to continue write processing for the second data track based on the first prediction information.

A system 100 for the erasure of data from a tape cartridge 110 has a data tape 112, a cartridge memory (CM) chip and a controller 102 in communication with a magnetic head 108, a tape driver 106 and a

The present invention provides a system for the erasure of data from a tape cartridge having a data tape and a CM chip, the device comprising: a controller in communication with: a magnetic head; a tape driver; and an antenna, wherein, when a data cartridge is detected by the controller, the controller is operable to signal to the antenna to determine the CM chip identification data; and, the controller is operable in dependence on the received CM chip identification data to instruct the antenna to overwrite at least a portion of the non-protected memory of the CM chip.

The present invention provides a system for the erasure of data from a tape cartridge having a data tape and a CM chip, the device comprising: a controller in communication with: a magnetic head; a tape driver; and an antenna, wherein, when a data cartridge is detected by the controller, the controller is operable to signal to the antenna to determine the CM chip identification data; and, the controller is operable in dependence on the received CM chip identification data to instruct the antenna to overwrite at least a portion of the non-protected memory of the CM chip.

According to one embodiment, a magnetic disk device includes a first disk having a first data track and a second data track, a first write head, a write processing unit, an error correction unit, a correction limit prediction unit, and a determination unit. During a write period, the correction limit prediction unit calculates an excess amount, calculates a metric value by multiplying a first weight coefficient by the excess amount, updates a cumulative metric value, and generates first prediction information. The determination unit determines whether or not to allow the write processing unit to continue write processing for the second data track based on the first prediction information.

To provide a manufacturing method for a disk device suitable for improving yield at a self-servo write process, and a disk device.SOLUTION: According to one embodiment, a manufacturing method for a disk device is provided. The manufacturing method for the disk device includes acquiring information about a write width of a head. The manufacturing method for the disk device includes adjusting the seek speed of the head when writing a spiral pattern to a disk according to the acquired write width.SELECTED DRAWING: Figure 5

The embodiment of the utility model provides degaussing equipment which comprises a warehouse entering module, a degaussing module and a degaussing module, the warehouse entering module is provided with a warehouse entering opening, the warehouse entering opening is used for inserting a magnetic medium, and the warehouse entering module is configured to suck the magnetic medium into the degaussing equipment; the degaussing module is provided with a degaussing area, the warehouse entering module comprises a pushing mechanism, and the pushing mechanism is used for pushing the magnetic medium to the degaussing area; a magnetic field intensity sensor is arranged in the demagnetization module, and the magnetic field intensity sensor is configured to detect the magnetic field intensity of the demagnetization area; the controller is electrically connected with the magnetic field intensity sensor, and the controller is configured to control the demagnetization module to demagnetize the magnetic medium; and the delivery module is configured to receive the demagnetized magnetic medium. The self-suction warehouse entering module is adopted, various sensors are arranged, and the safety, transparency and high efficiency of the whole demagnetization process are improved.

Provided are a method for manufacturing a disk device and a disk device, which are suitable for improving the yield of a self-servo writing process. According to one embodiment, a method of manufacturing a disk device is provided. A method of manufacturing a disk device includes acquiring information on a write width of a head. The manufacturing method of the disk device includes adjusting a seek speed of a head when writing a spiral pattern to the disk according to the acquired writing width.

An improved degaussing system for sanitizing data stored in a magnetic storage device (MSD) includes a magnetic field generating element configured to generate a directional field toward a media tray for retaining the MSD. Heating elements disposed proximate to the media tray heats the MSD to an elevated temperature before or during application of a magnetic field. An insulating element at least partially encloses the heating elements to isolate the magnetic field generating element from the heating element.

According to one embodiment, a magnetic recording device includes a magnetic recording medium, a magnetic head configured to record information on the magnetic recording medium, and a controller configured to control the magnetic recording medium and the magnetic head. The magnetic head includes a coil, a first magnetic pole configured to generate a magnetic field according to a recording current supplied to the coil, and a light emitting section configured to irradiate the magnetic recording medium with a light to locally increase a temperature of the magnetic recording medium. The controller is configured to perform a first operation and a second operation. In the first operation, the controller is configured to record a first servo position information in a first region of the magnetic recording medium. In the second operation, the controller is configured to perform a repair operation if a first condition is not satisfied.

According to one embodiment, a magnetic recording device includes a magnetic recording medium, a magnetic head configured to record information on the magnetic recording medium, and a controller configured to control the magnetic recording medium and the magnetic head. The magnetic head includes a coil, a first magnetic pole configured to generate a magnetic field according to a recording current supplied to the coil, and a light emitting section configured to irradiate the magnetic recording medium with a light to locally increase a temperature of the magnetic recording medium. The controller is configured to perform a first operation and a second operation. In the first operation, the controller is configured to record a first servo position information in a first region of the magnetic recording medium. In the second operation, the controller is configured to perform a repair operation if a first condition is not satisfied.

The unmanned automatic batch degaussing device comprises a degaussing mechanism, a crushing mechanism, a collecting mechanism, an information processing mechanism and a framework, the degaussing mechanism comprises a transmission mechanism, an identification mechanism and a degausser, the transmission mechanism transmits a plurality of hard disks into the degausser for degaussing, and the crushing mechanism is used for crushing the hard disks; the recognition mechanism located above the transmission mechanism can photograph the hard disk entering the magnetic eraser and transmit the photograph to the information processing mechanism to facilitate analysis and recording of the information processing mechanism; the crushing mechanism is positioned below the tail part of the transmission mechanism and can crush the demagnetized hard disk; the collecting mechanism is located below the smashing mechanism and used for collecting the smashed hard disks. According to the invention, the SN number of the hard disk can be identified, analyzed and recorded, so that the planning and statistics of the subsequent input hard disk can be facilitated, and the integrated functions of demagnetizing, crushing and collecting the hard disk can be realized, so that the hard disk can be properly handled after a fault occurs, and important data in the fields of finance, medical treatment and military institutions can be prevented from being leaked.

The embodiment of the invention relates to a magnetic disk device. A magnetic disk device (1) is provided with a first disk having a first data track and a second data track, a first write head, a write processing unit, an error correction unit, a correction limit prediction unit (65), and a determination unit. During a writing period, a correction limit prediction unit (65) calculates an excess OVR, calculates a metric value (Mer) by multiplying the excess OVR by a first weight coefficient, updates an accumulated metric value (ME), and generates first prediction information. The determination unit determines, on the basis of the first prediction information, whether or not to cause the write processing unit to continue write processing on a second data track.

A media declassification device receives a media component such as a magnetic hard disk drive, and deletes data stored thereon by physical agitation and dismantling the media component. A cutting blade shears or grinds a perimeter region around a top of the hard disk drive (HDD drive, or simply drive) to a predetermined depth calculated to remove heads from screws and other fasteners securing a metal top panel. Inversion of the drive allows a magnetic media platter upon which data is stored to simply drop out. The magnetic platter is fed into a shredding device for obliteration to sufficiently small particles for declassification, while rare earth magnets are removed from the remaining drive chassis, and the now declassified chassis discarded into a recycling stream.

The present invention provides a system for the erasure of data from a tape cartridge having a data tape and a CM chip, the device comprising: a controller in communication with: a magnetic head; a tape driver; and an antenna, wherein, when a data cartridge is detected by the controller, the controller is operable to signal to the antenna to determine the CM chip identification data; and, the controller is operable in dependence on the received CM chip identification data to instruct the antenna to overwrite at least a portion of the non-protected memory of the CM chip.

The invention involves centric insertion of electronic equipment (26) undergoing destruction by a drawer (15) into a destroying device, into an air gap (21) between the central arms of the cores (11) of an electromagnet (10), and initiating the discharge of the accumulated electrical energy in order to destroy this electronic equipment (26) by means of a movable spark gap (14). This spark gap constitutes a moving assembly (13) comprising a motor (20) with a controller, a movable carriage (16) with an electrode (12) seated on the guides (17) of the moving assembly (13), and a fixed carriage (18) with an electrode (12).

An improved degaussing system for sanitizing data stored in a magnetic storage device (MSD) includes a magnetic field generating element configured to generate a directional field toward a media tray for retaining the MSD. Heating elements disposed proximate to the media tray heats the MSD to an elevated temperature before or during application of a magnetic field. An insulating element at least partially encloses the heating elements to isolate the magnetic field generating element from the heating element.

The utility model discloses computer hardware degaussing equipment, which belongs to the technical field of degaussing equipment, and comprises a degaussing machine, a degaussing drawer is arranged in the degaussing machine in a sliding manner, the degaussing drawer comprises a drawer frame, a movable storage plate is arranged in the drawer frame in a sliding manner, and a reset piece connected with the movable storage plate is arranged on the side surface of the drawer frame. And an automatic locking piece for clamping the resetting piece is arranged on the side surface of the drawer frame. According to the technical scheme, when hard disks to be demagnetized are stacked, the movable storage plate is pushed to the bottommost position, the automatic locking piece can automatically clamp the matched sliding block, then the position of the movable storage plate is limited, orderly stacking of the hard disks is facilitated, after demagnetization is completed, the automatic locking piece is screwed, the restraining effect of the automatic locking piece on the matched sliding block in the reset piece fails at the moment, and therefore the hard disks can be demagnetized. At the moment, the reset tension spring can pull the movable storage plate and the hard disks on the movable storage plate to move upwards, workers can conveniently and smoothly take down all the hard disks, and the working efficiency is improved.

Write commands in a shingled magnetic recording (SMR) drive are efficiently executed when a write command and associated write data are received by an SMR HDD from a host while the target SMR band for storing the write data is undergoing a refresh operation. In response to the write command, the HDD suspends the refresh operation, stores the write data in nonvolatile memory, and informs the host that the write command has been completed. After the write data are stored in nonvolatile memory, the HDD resumes the refresh operation, and the remaining unrefreshed data in the target SMR band are refreshed by being rewritten to the spare SMR band. The nonvolatile memory can include the spare SMR band in some instances, the target SMR band in some instances, and in both the spare SMR band and the target SMR band in some instances.