15results 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

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.

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.

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.