179results about "Erasing method" patented technology

Techniques for ultrahigh density writing on an erasable magnetic medium include using a micromachined mechanism having two probes for writing to the medium. Use of the two probe embodiment eliminates the need to change the magnetic orientation of the probe. In another embodiment, a single probe is provided which is heated to the vicinity of its Curie temperature to enable the magnetic orientation of the probe to be switched. The probe may be heated to its Curie temperature through the use of a heating element or a focused laser. In another embodiment of the present invention, either the magnetic orientation of the probe or the magnetic orientation of the medium may be switched through the combination of a static magnetic field, a radio frequency magnetic field and, under certain circumstances, the magnetic field of the probe. In all cases, the writing techniques enable information to be written to a magnetic medium in a manner which enables the information to be erased and the medium rewritten.

A magnetic tape of the present invention comprises a plurality of servo bands and servo signals for performing tracking-control of a magnetic head, wherein the servo signals are recorded on the servo bands, wherein a DC magnetization region magnetized in one direction by direct current is arranged along longitudinal directions of the magnetic tape on the servo bands, wherein each of the servo signals is magnetized in a reverse direction for the one direction of a DC magnetization and is recorded within the DC magnetization region, and wherein any of a relative ratio and relative difference of DC magnetization intensity in the DC magnetization region and recording magnetization intensity of each of the servo signals differs for each of the servo bands.

A servo writer according to the present invention is a servo writer which writes a servo signal on a servo band of a magnetic tape. It comprises a magnetic tape driving system in which a magnetic tape supplied from a supply reel is taken up by a take-up reel to drive the magnetic tape; a DC erasing head which is slidably in contact with said driving tape and which DC-magnetizes said servo band with imparting an azimuth relative to said servo band; and a servo signal writing head provided on a downstream of said DC erasing head in the driving direction of the magnetic tape, which is slidably in contact with said driving tape and which magnetizes the servo band by a magnetizing force having a component with a reverse magnetizing force relative to the magnetizing force of the DC erasing head in the lengthwise direction of the magnetic tape.

A magnetic tape of the present invention comprises a plurality of servo bands and servo signals for performing tracking-control of a magnetic head, wherein the servo signals are recorded on the servo bands, wherein a DC magnetization region magnetized in one direction by direct current is arranged along longitudinal directions of the magnetic tape on the servo bands, wherein each of the servo signals is magnetized in a reverse direction for the one direction of a DC magnetization and is recorded within the DC magnetization region, and wherein any of a relative ratio and relative difference of DC magnetization intensity in the DC magnetization region and recording magnetization intensity of each of the servo signals differs for each of the servo bands.

After a DC erasing is performed in a direction by permanent magnets on a servo signal recording part, servo signals are recorded in the signal recording area of the servo signal recording part by a magnetic field in the direction opposite to that of the DC erasing. Thus, in a recording method for a magnetic recording medium having a data signal recording part and the servo signal recording part on a magnetic layer, accurate servo signals can be recorded and reproduced even on the medium having the magnetic layer of 0.13 μm or smaller.

A method of controlling a hybrid HDD to permanently deactivate a non-volatile cache support mode by determining whether a limit in the use of a non-volatile cache is passed, and a recording medium and apparatus suitable for the control method. The control method of a hybrid hard disk drive having a hard disk and a non-volatile cache includes determining whether an erasure number of the non-volatile cache exceeds a usage limit based on the erasure number of the non-volatile cache, and permanently deactivating a non-volatile cache support mode when the erasure number of the non-volatile cache is determined to exceed the usage limit.

A method of targeted corruption of user data in a shingled magnetic recording disk includes identifying user data on a Track_N targeted for corruption; identifying a readback centerline of the Track_N; identifying a readback centerline of an adjacent track to Track_N; acquiring user data of the adjacent track; and rewriting the user data of the adjacent track with an offset write centerline to overwrite magnetic material at the readback centerlines of both Track_N and the adjacent track.

A method for performing a defect scan according to the characteristics of channels of a data storage system by determining design parameters based on the channel characteristics includes measuring characterization values related to the performance for channels of the data storage system; determining parameters for the respective channels based on the measured characterization values, the parameters for determining the data processing characteristics of the respective channel; and performing a defect scan on the data storage system using the determined parameters in a data processing process for the respective channels.

A method is presented of erasing, in a document data processing device, a stored information pattern on a rewritable data carrier that is accessible by a data processing facility of the document data processing device. The document data processing device includes primary processes for processing document data, wherein data may be stored on the data carrier, and secondary processes for erasing stored data, through overwriting a selected storage area of the carrier by a shredding pattern. According to the method, the primary and secondary processes are run asynchronously, e.g., the secondary processes are run in background, in order not to hinder the primary processes. In a particular embodiment, an initial shredding run is made directly after a file is no longer used, and additional shredding runs are made in background.

A method and system for the erasing of data from a non-volatile recording medium includes a non-volatile recording medium controller, a non-volatile recording medium, and a CPU. A data pattern used in an erasure command is sent to the non-volatile recording medium a single time. Consequently, the amount of data transferred to the non-volatile recording medium controller is reduced to a minimum. After receiving the erasure command, the non-volatile recording medium controller overwrites an erasure area with the data pattern.

Embodiments of the invention prevent a spindle motor from stopping rotation while data on a magnetic disk is being erased by using a permanent magnet. In one embodiment, data in the whole area of the magnetic disk is erased as a consequence of the magnetic disk rotating in the magnetic field of the permanent magnet located so as to face a part of the magnetic disk. A back yoke is located so as to face a base. The back yoke gives a magnetic force to the spindle motor in the opposite direction of the magnetic force of the erasing permanent magnet so that the fluid dynamic bearing spindle motor can retain the rotation as required without stopping rotation.

An application specific device for erasing data from a long-term storage device includes a power supply, a control circuit, and an interface to the storage device. The control circuit controls the long-term storage device to irretrievably remove data from the storage device. The storage device may be, for example, a hard disk drive or compact flash memory. The application specific device is physically small, is operating system independent, and has simple interface that is useable by non-computer professionals.

A data erasing device that erases data recorded on a magnetic disk, by a magnetic field generated in a horizontal direction by magnets, in order to prevent leakage of the data recorded on the magnetic disk of a magnetic disk device to be abandoned. The data erasing device includes a main body case having a path on which a tray is reciprocated, a demagnetizing circuit having plural permanent magnets adjacently disposed along the path in mutually adsorbing polarities, and a tray for accommodating the magnetic recording medium, and capable of reciprocating on the path. This tray includes a first accommodation groove and a second accommodation groove for accommodating the magnetic disk device. The first accommodation groove and the second accommodation groove cross each other to form an angle of 45 degrees or 90 degrees.

The invention relates to a machine integrating demagnetization and smashing. The machine comprises a feeding device and a hard disc piece demagnetization module, the feeding device is arranged above the hard disc piece demagnetization module and provided with a feed inlet, the hard disc piece demagnetization module is provided with a demagnetization coil, the demagnetization coil is provided with a framework cavity, and the width of either or both of the feed inlet and the framework cavity of the demagnetization coil is smaller than the thickness of a hard disc. By means of the machine integrating demagnetization and smashing, the hard disc piece can be directly demagnetized and smashed, and demagnetization efficiency can be further improved.

The invention enables a magnetic disk drive to be inserted and removed against an attraction force exerted by a magnetic force that is strong enough to erase data on a magnetic disk enclosed within a metal case. A converting mechanism comprising a ballscrew and a ballscrew nut bracket is provided that converts rotational motion of a handle into translational motion of an HDD holder; by rotating the handle, the HDD holder with the hard disk drive mounted thereon is moved in the inserting and removing directions by overcoming the attraction force being exerted by the magnetic field generated by means of a permanent magnet. An electric motor may be used to generate the rotational force.

A method and a storage system are provided for implementing fragmented stream handling for persistent media including shingled disk drives (SDDs). A plurality of Exception Regions for recording stream commands is defined for disk regions. One state is maintained in each of the Exception Regions including a free Exception Region, an active Exception Region, a recovery Exception Region and a used Exception Region. TRIM commands are issued by a host to the drive to indicate deleted content.

The invention relates to demagnetizing and crushing integrated equipment and particularly relates to demagnetizing and crushing integrated equipment of electronic information storage equipment. The technical problem to be solved by the invention is to provide the demagnetizing and crushing integrated equipment of the electronic information storage equipment, by which information can be thoroughly destroyed. In order to solve the technical problem, the invention provides such demagnetizing and crushing integrated equipment of the electronic information storage equipment; the demagnetizing and crushing integrated equipment comprises a rack, a demagnetizing box, a demagnetizing coil, a motor, a cam, a first roller, a lifting rod, a first baffle, a first spring, a stirring rod, a guide plate, crushing boxes and the like; the rack is provided with the demagnetizing box and the two crushing boxes; the crushing boxes are located at the left and right sides of the bottom of the demagnetizing box; and a through hole is formed in the top of the demagnetizing box. By using the demagnetizing and crushing integrated equipment, the sufficient demagnetization and crushing of electronic information equipment are realized; and the lifting rod is provided with a circular collecting plate for collecting electronic information equipment with small size in order to prevent the equipment from falling onto the cam and the motor.

The invention enables a magnetic disk drive to be inserted and removed against an attraction force exerted by a magnetic force that is strong enough to erase data on a magnetic disk enclosed within a metal case. A converting mechanism comprising a ballscrew and a ballscrew nut bracket is provided that converts rotational motion of a handle into translational motion of an HDD holder; by rotating the handle, the HDD holder with the hard disk drive mounted thereon is moved in the inserting and removing directions by overcoming the attraction force being exerted by the magnetic field generated by means of a permanent magnet. An electric motor may be used to generate the rotational force.

The present invention defines in a main body (1) of a recorded data eraser a cavity (2) for insertion of a magnetic storage device (M) in the cavity and includes a generator (3) for generating a magnetic field so as to erase recorded data in the device (M) inserted in the insertion cavity (2) and a magnetic body (4) arranged within the magnetic field generated by the generator (3).

A servo writer according to the present invention is a servo writer which writes a servo signal on a servo band of a magnetic tape. It comprises a magnetic tape driving system in which a magnetic tape supplied from a supply reel is taken up by a take-up reel to drive the magnetic tape; a DC erasing head which is slidably in contact with said driving tape and which DC-magnetizes said servo band with imparting an azimuth relative to said servo band; and a servo signal writing head provided on a downstream of said DC erasing head in the driving direction of the magnetic tape, which is slidably in contact with said driving tape and which magnetizes the servo band by a magnetizing force having a component with a reverse magnetizing force relative to the magnetizing force of the DC erasing head in the lengthwise direction of the magnetic tape.

A method of erasing a servo pattern of a hard disk drive includes reading a servo pattern recorded on a disk, generating an erase pattern to erase the servo pattern based on the servo pattern obtained in the reading of the servo pattern, and erasing the servo pattern by using the erase pattern while the disk is rotated. The servo pattern recorded on the hard disk drive may be uniformly erased. Also, a stabilization time to stabilize a read / write head after the position control of the read / write head that is needed when a servo writer is used may be avoided so that a time to erase a servo pattern may be reduced.

There is provided with a method for dealing with data recording media adapted to readily erase magnetic data recorded in magnetic recording media or destroy data recorded in optical recording media and a device for carrying out said method. Further, there is provided with a method for disposing of electronic device for destroying electronic devices and a device for carrying out said method. A device for dealing with data recording media including an excitation coil for generating a magnetic field having a predetermined strength, a magnetron for radiating an electromagnetic wave having a predetermined frequency at a predetermined strength, and a receptacle adapted to accommodate a magnetic recording medium or an optical recording medium, wherein the receptacle is made of a non-magnetic material capable of shielding the electromagnetic wave, wherein the receptacle has an outer periphery around which the excitation coil is wound so as to induce a magnetic field within the receptacle, and wherein the receptacle has a wall provided with the magnetron, so that the electromagnetic wave is radiated toward inside of the receptacle.

A method of erasing information on one or more disks in a disk drive uses a high strength magnetic field to erase the disks while the disks are in the HDD assembly. The design of the head disk enclosure provides a reduced thickness in a localized region over the disks. This allows a narrower working magnetic gap of the HDD level disk erase apparatus. The localized region of the HDD may be a formed indentation on the top cover, elimination of flange, and reduced floor thickness of the HDD base.

A servo pattern is positioned in a DC erased portion to which a DC erase process has been performed, and recording tracks and track groove portions (discrete portions) are positioned in an AC erased portion to which an AC erase process has been performed. The track groove portions extend in a circumferential direction. The AC erased portion and the DC erased portion are both made of a magnetic material. In the servo pattern, four lines of preamble portions extending almost in a radial direction are formed and a plurality of pit portions disposed in a dotted manner in two lines are arranged. The pit portions are positioned rearward of the preamble portions in respect of a scanning direction of a magnetic head.

A recorded data eraser for a magnetic storage device for erasing data in the magnetic storage device (M) by a magnetic field generated by a coil (3), into which a capacitor (5) is discharged, has an inductance (H) and an internal resistance (R) of the coil (3) and a predetermined voltage (V) applied to the capacitor (5) set in appropriate amount respectively so as to generate a rebound phenomenon at least once, whereby a direction of the magnetic field is reversed by a reversed current flowing in the coil with a change in polarity of a transient voltage of the discharge of the capacitor into the coil, thereby completely or almost completely erasing recorded data from a storage medium in the magnetic storage device (M)

Herein described are a method and a system for deleting a data pool generated by a data storage device. The data pool may be generated using a networked data storage device that comprises one or more data storage drives. The method may be implemented by way of erasing metadata associated with the data pool. The method may further comprise erasing data associated with the data pool wherein the data resides within one or more partition payloads of one or more partitions of one or more data storage drives. The system may be implemented using a memory, a software resident in the memory, and a processor for executing the software. When the processor executes the software, metadata associated with forming the data pool may be erased. Furthermore, any data stored in the data pool may be erased.