144 results about "Disk pack" patented technology

A disk drive is disclosed comprising a disk for storing data, the disk comprising a public area for storing plaintext data and a pristine area for storing encrypted data. The disk drive comprises a head for reading the encrypted data from the pristine area of the disk, and a control system for controlling access to the pristine area of the disk. Authentication circuitry within the disk drive is provided for authenticating a request received from an external entity to access the pristine area of the disk and for enabling the control system if the request is authenticated. The disk drive further comprises a secret drive key, and decryption circuitry responsive to the secret drive key, for decrypting the encrypted data stored in the pristine area of the disk.

A disk drive includes a disk having a recording surface, a head stack assembly that includes a body portion, an actuator arm cantilevered from the body portion and a head gimbal assembly supported at the actuator arm. The head gimbal assembly includes a suspension having a first end and a second end, the first end being attached to the actuator arm, a slider coupled to the second end of the suspension, the slider comprising a transducer for reading from and writing to the recording surface. A gimbal is coupled to the second end of the suspension and to the slider. An array of diodes is attached to the suspension to protect the transducer from electrostatic discharge or electrical overstress events.

Provided are a magnetic disk comprising a granular magnetic recording layer which causes less noise even with a recording capacity thereof of 250 G or more bits per square inch; and a method for manufacturing the same. The magnetic disk according to the present invention comprises: a granular magnetic recording layer (20) which is formed on a disk substrate 10 directly or via an intermediate layer and which has non-magnetic regions between granular columnar particles; and an auxiliary recording layer (22) which is formed on the granular magnetic recording layer 20 and which causes exchange interaction among the granular columnar particles, wherein the auxiliary recording layer (22) contains 0.1 to 3 moles of oxygen.

A disk drive including a disk drive base and a cover attached to the disk drive base. The disk drive further includes a rotatable disk including a disk surface extending to an outer periphery. The disk drive further includes a spindle motor including an axis of rotation. The spindle motor is rotatably coupled to the disk drive base for rotating the disk about the axis of rotation. The disk drive further includes a shroud surface concentrically formed about and adjacent the outer periphery. The disk drive further includes a cavity formed in the shroud surface. The cavity extends to a cavity opening adjacent the outer periphery. The disk drive further includes an airflow diverter element extending from the cover towards the disk surface radially between the cavity opening and the axis of rotation for diverting disk rotation induced airflow adjacent the disk surface.

In a method of manufacturing a magnetic disk including at least a magnetic recording layer on a substrate 1 and used for vertical magnetic recording, in a step of forming, on the substrate 1, the magnetic recording layer composed of a ferromagnetic layer 5 having a granular structure and an exchange energy control layer 7 constituted by a laminated layer formed on the ferromagnetic layer 5, at least the exchange energy control layer 7 is formed through sputtering in an atmosphere of a rare gas having a greater mass than an argon gas. The rare gas having a greater mass than the argon gas is a krypton (Kr) gas, for example. The exchange energy control layer 7 is a laminated layer composed of a first layer containing Co or a Co-alloy and a second layer containing palladium (Pd) or platinum (Pt), for example.

A disk drive assembly enclosed in a housing, having a head disk assembly including a spindle, disks axially attached to the spindle, a driving motor for rotating the spindle, a read / write head, and a carriage assembly including a positioning arm, slider mechanism and a actuator / suspension mechanism. The slider mechanism is slidably attached to the positioning arm and the actuator suspension mechanism is attached to the positioning arm. The read / write head for reading or writing information to the disks is attached to the head positioning assembly at the slider mechanism. A fairing is attached to the positioning arm. The head positioning assembly is enclosed within the skimmer structure. The skimmer structure has a plurality of slots for receiving the disks of the disk pack. As the disks of the disk pack pass through the slots of the skimmer structure air is stripped away from the disks.

In an information network, an interactive display allows a user to choose products or elements on one screen axis (Y) and compare their characteristics or attributes on a second screen axis (X), thereby aiding a user to select a product from all available information according to the user's individual requirements. The information network includes at least one knowledge site containing product information for access by a user through a terminal. The terminal includes a processor coupled to an interactive display and a storage disk. The processor includes a Java operating system; an application program for processing product information by categories in terms of elements and attributes, and a browser enabling a user to access and interact with the knowledge site through Java applets. The disk contains product information by category received from the knowledge site and transformed into the form of HTML parameters within HTML files.

The invention embodiment discloses a distributed RAID (redundant array of independent disks) establishing method and a distributed RAID establishing device, which belong to the technical field of RAID, and solve the problem of the prior art that as the IO data access of the host might be concentrated in an area of a RAID group, a data access hotspot is produced. The technical scheme includes the following steps: dividing each disk in a disk pack into multiple disk blocks with identical capacity; selecting corresponding disk blocks from each disk according to the preset only mapping relation to be combined into a virtual disk and then establishing a virtual disk group; establishing a RAID group according to the virtual disk group; and striping the RAID group and reading-writing data through the striped RAID group. The distributed RAID establishing method and distributed RAID establishing device can be applicable to the disk group established with at least two groups of RAID groups.

A method and apparatus for start-stop testing magnetic heads and hard disks in real disk-drive environment is provided. The tester has essentially the same dimensions as a conventional disk drive so that rotation of the disk pack inside the tester housing generates the same aerodynamic conditions as in a real disk drive. An accurate head positioning system, the operation of which does not depend on the deterioration of the magnetic conditions of the head and disk, is located inside the tester housing, and the friction and sticking forces can be measured till the moment of physical crash inside the housing. An essential advantage of the tester of the invention in that the measurement and positioning systems are combined into a single unit. The aforementioned combined system is based on the use of a Hall-effect sensor attached to the voice coil of the type used in the disk drive. Friction forces between the magnetic heads and the disks are measured by utilizing a voltage applied to the voltage-to-current converter.

A hard disk drive includes a disk pack having at least one disk for recording and / or storing data and a spindle motor that support and rotates the disk, a base to which the disk pack is mounted, a cover that covers an upper surface of the base, and a respective filter disposed close to each of at least one of the major surfaces of the disk and extending in the radial direction of the disk including over at least an inner peripheral region of the disk. The filter has an absorbent layer capable of absorbing particles that come in contact with it. Particles on the surface of the disk, from the inner to the outer peripheral regions of the disk, are removed by the filter when the disk is rotated and the particles are flung off of the disk. Thus, particles will not damage the magnetic head(s) of the hard disk drive nor will the particles cause errors to occur in the recording and / or reproducing of data.

A method of manufacturing disk drives that are subject to disk pack imbalance includes steps of measuring the disk pack imbalance of each drive and assigning each of the drives to one of a predetermined plurality of categories, depending upon the measured disk pack imbalance. The measured imbalance of the disk drives assigned to fewer than the predetermined plurality of categories may then be reduced. Each category may be associated with one or more customers and the drives assigned to each category may be shipped to the associated customer(s).

The invention discloses a data migration method and a data migration device. The data migration method is used in storage equipment. The storage equipment comprises at least one hard-disk pack, and each hard-disk pack comprises a plurality of hard disks. The method includes the steps that the hard disks are divided into a first hard disk set and a second hard disk set, wherein the space utilization rate of each hard disk in the first hard disk set is higher than a first threshold; the first hard disk set is divided into a first hard disk subset and a second hard disk subset, wherein the IO accessing frequency of each hard disk in the first hard disk subset is lower than a second threshold; data stored in the hard disks in the first hard disk subset are migrated to the hard disks in the second hard disk set. The data migration method and the data migration device can avoid weighing load of the hard disks during data migration.

The present invention provides a decorative light hanging system for presenting a lighted outline of a building structure, and includes a decorative lighting strand, a plurality of releasable magnetic alignment holder pairs each pair comprising oppositely charged magnetic disks including a first disk attached to the building structure and a second disk with a conduit mount attached thereon for receiving the decorative lighting strand therein, and a hanger for positioning and aligning the second disks upon the corresponding first disks.

The invention includes a method making a balanced disk pack for a hard disk drive, from a disk pack including a spindle motor rigidly coupled, and aligned by at least two open screw holes, with a disk clamp. The invention includes the resulting balanced disk packs, as well as hard disk drives built with such balanced disk packs. The invention also includes apparatus providing the means for implementing the steps of making a balanced disk pack from a disk pack. The invention includes at least one mechanical counterbalance for use in balancing the disk pack of a hard disk drive.

An automatic gearbox for a vehicle with at least one hydraulically actuated shifting element made as a transmission brake or transmission clutch. The shifting element has an inner disk carrier and an outer disk carrier where inner disks and outer disks are arranged rotationally fixed but axially displaceably. The disks are arranged in alternating sequence one after the other to form a disk pack which can be acted upon by an actuator with an axial actuation force to close the shifting element, and in which one disk carrier is connected to non-rotating or rotating gearbox components and the other disk carrier can be connected via a synchronization device to rotating gearbox components. To reduce the shifting time that can be achieved with such a gearbox in carrying out a transmission ratio change process, a synchronization device can be actuated by way of a second actuator of its own.

An embodiment of the invention discloses a data processing method and a data processing device, and relates to the technical field of storage. By the data processing method and the data processing device, data writing speed and data arrangement speed can be increased simultaneously, IOPS (input / output operation per second) performance of the data processing process is improved, and further, rapidness and persistence of data can be realized. The data processing method specifically includes if the occupied quantity of a log space of a log area of a first hard-disk pack is higher than a preset threshold value, writing first data and feature values thereof both read from an internal storage into a log area of a second hard-disk pack, and pausing arranging data written in the log area of the second hard-disk pack into a first data area; according to the data feature values written in the log area of the first hard-disk pack, arranging the data written in the log area of the first hard-disk pack to a second data area. The data processing method and the data processing device are applied to data read-write processes.

A device streamlines air flow inside a hard disk drive with a stationary afterbody that is located adjacent to each of the disks. The device gradually expands the air flow so that the speed of the air flow gradually decreases while pressure increases. This design reduces losses in system momentum due to sudden expansion of the air in the drive. In addition, air flow moving toward the disk pack may be contracted to allow efficient energy conversion from pressure energy to kinetic energy prior to merging of the bypass air flow with the air flow among the disks. The device has a comb-like structure that is offset from the disk pack in the radial direction. The structure fulfills an aerodynamic function, reduces track misregistration, lowers overall aerodynamic dissipation, and fulfills a filtration function.

The invention provides a storage method and device for CDN edge node files. The storage method includes the steps that a raid card supporting a Nonraid mode is selected, and hard-disk names of all hard disks are obtained; a hard-disk pack is connected with an edge node server through the raid card; the hard-disk pack is initialized; according to the hard-disk names of all the hard disks, Hash values of file names of all to-be-stored files and the preset rule, all the to-be-stored files are stored to the corresponding hard disks respectively. All the hard disks are in the independent operation state, it is avoided that in the prior art, a hard disk is required to serve as a redundancy disk when a raid5 is established, and the maximum capacity of the edge node server is increased; even if two or above fault disks appear, it is avoided that the whole server cannot be used, and when the fault disks are replaced, data of the fault disks of the edge node server only needs to be newly synchronized, fault time is greatly shortened, and the stability of a system is improved.

The invention relates to the memory technical field and discloses a redundancy protected method, a device and a system; the method comprises the following steps: disks of at least two memory nodes are grouped to obtain at least one disk pack; and then according to the disk number included by each disk pack, a corresponding independent redundant disk array type is selected from the corresponding relation of a preset disk number and an independent redundant disk array type; and the selected independent redundant disk array type is utilized for figuring out check blocks of each disk in the corresponding disk pack; the check blocks of each disk are respectively stored in each disk of the corresponding disk pack. The embodiment of the invention can simultaneously support the redundancy protection of the disk pack containing different disk counts.

A new transfer case with a new and improved clutch actuator and operator is disclosed. The operator is operably connected to a first element of a ball ramp type transfer case clutch actuator that can be rotated, relative to a second element of the clutch actuator, to effect or release compression in the disk pack of the transfer case clutch. The operator comprises a moving coil linear actuator having a stationary magnet and a coil that is mounted adjacent to the stationary magnet for reciprocating movement which is controlled by controlling the flow of current through the coil. Linear movement of the coil is translated into rotational movement of the first element of the clutch actuator by a connecting rod.

Embodiments of the present invention are directed to a data storage device comprising a housing and a disk pack mounted to the housing which has a plurality of disks that are rotatable relative to the housing. The disk pack defines an axis of rotation and a radial direction relative to the axis. The disk pack has a upstream side wherein air flows away from the disks, and an downstream side wherein air flows toward the disk. The data storage device further comprises an actuator mounted to the housing which is movable relative to the disk pack and a bypass channel for directing an airflow generated by rotation of the disks from the upstream side of the disk pack to the downstream side of the disk pack.

A device streamlines air flow inside a hard disk drive with a stationary afterbody that is located adjacent to each of the disks. The device gradually expands the air flow so that the speed of the air flow gradually decreases while pressure increases. This design reduces losses in system momentum due to sudden expansion of the air in the drive. In addition, air flow moving toward the disk pack may be contracted to allow efficient energy conversion from pressure energy to kinetic energy prior to merging of the bypass air flow with the air flow among the disks. The device has a comb-like structure that is offset from the disk pack in the radial direction. The structure fulfills an aerodynamic function, reduces track misregistration, lowers overall aerodynamic dissipation, and fulfills a filtration function.

A clutch adapted to transmit the motion from a driving shaft to a driven shaft, having an axis of rotation coaxial to the driven shaft and comprising, a ring gear, adapted to receive the motion from the driving shaft and coaxial to the axis of rotation, a first bell integral in rotation with the ring gear and coaxial to the axis of rotation, an axially fixed hub internal to the first bell and coaxial to the axis of rotation, the axially fixed hub being adapted to be connected in rotation to said driven shaft an axially movable pressure assembly including a disk-pusher element, a disk pack, including a plurality of driving disks integral in rotation with the first bell and alternated with a plurality of driven disks, the disk pack being coaxial to said axis of rotation and being comprised between the axially fixed hub and the disk-pusher element; a plurality of elastic elements, adapted to cause a separation of the disk-pusher element from the axially fixed hub and from the disk pack; and a centrifugal assembly, including a mass carrier and a plurality of centrifugal masses, the centrifugal assembly being coaxial to the axis of rotation and being integral in rotation with a second bell, the second bell being moreover integral in rotation with the first bell, the centrifugal assembly axially co-operating with said pressure assembly to cause an axial compression of the disk pack. The clutch comprises at least one first clearance-recovery device of a unidirectional type, adapted to limit the separation of the disk-pusher element from the axially fixed huband from the disk pack, and a second clearance-recovery device of a unidirectional type, adapted to enable an axial movement of the centrifugal assembly only towards the disk-pusher element.

According to one embodiment, a magnetic disk drive in the present embodiment includes a disk including tracks, each including servo sectors, a head, and a controller configured to acquire first correction data for repeatable runout occurring in a first direction, and second correction data different from the first correction data, to write the first correction data within a first permitted range in the first direction, to write the second correction data within a write permitted range including the first permitted range and a second permitted range in a second direction opposite to the first direction, to read at least one of the first correction data and the second correction data, and to correctly place the head.

The invention relates to a solid state disk and a method for realizing a redundant array of independent disks of the solid state disk. The method comprises the steps of by taking flash particles of the solid state disk as minimal storage units, establishing a raid5; forming a disk pack; generating a redundancy mechanism; and by taking the flash particles as backup disks of the raid5, virtualizingall the disks and backup disks of the disk pack into a complete disk by adopting a hardware uninstalling method. All the flash particles form the disk array with a redundancy characteristic by adopting a virtualization technology; a user only can see one disk in a using process; and at the moment, a storage space available for the user is a capacity sum of a few flash particles. In addition, whenthe user stores data, the stored data is written in the flash particles in parallel, so that the data reading / writing speed is greatly increased. By adopting the redundancy mechanism of the raid5, thedata redundancy can be improved, and when one flash particle is damaged, other flash particles are not influenced, so that the stored data is protected.

The invention provides a data storage method, device and system, electronic equipment and a readable storage medium. The method comprises the steps of obtaining to-be-stored data; determining a target disk pack corresponding to the to-be-stored data in preset disk packs according to the type of the to-be-stored data, wherein the disk pack comprises a first disk pack and a second disk pack which have different storage strategies; and storing the to-be-stored data into the target disk pack according to the storage strategy corresponding to the target disk pack. Therefore, different storage strategies are set for the disk groups in advance, so that in practical application, data with different importance can be stored in different disk groups in a targeted manner by adopting different disk group storage according to the importance of different types of data, and on-demand storage of different data can be realized; and the effective utilization rate of storage resources of the distributed storage system is improved. And meanwhile, due to the fact that data of the corresponding type is correspondingly stored in each disk pack, storage management can be conveniently carried out on the distributed storage system.