225 results about "Hard disc drive" patented technology

A flexible printed circuit (FPC) for a hard disk drive includes a first preamplifier electrically connected to first read-write transducers and a second preamplifier electrically connected to second read-write transducers, where all transducers are driven via a single primary actuator, with a top FPC section including electrical traces between a fine actuator corresponding to one of the first transducers and a corresponding controller and a bottom FPC section including traces between a fine actuator corresponding to one of the second transducers and a corresponding controller. To inhibit potential crosstalk between the fine actuator traces and read traces and / or voice coil motor (VCM) traces, the fine actuator traces may be positioned not-adjacent to read traces, such as between write traces adjacent the read traces and serial input / output (SIO) traces adjacent VCM traces, and / or at least five trace-widths away from the VCM traces.

The disclosure relates to a voice coil motor (VCM) in a hard disk drive during a retract phase, wherein read-and-write heads of the hard disk drive are retracted by the VCM from a disk surface towards an end-of-travel parking condition with the heads climbing over a ramp starting from a ramp edge adjacent the disk surface. During the retract phase, the VCM is operated in a discontinuous mode comprising an alternation of on-times of duration TON and off-times of duration TOFF wherein supply of a drive current to the VCM is facilitated and countered, respectively. The duration TOFF of the off-times is varied to have a lower bound value at the ramp edge and to increase towards an upper bound value as the heads climb over the ramp towards the end-of-travel parking condition.

A hard disk drive suspension includes first piezoelectric elements provided at a first position, and second piezoelectric elements provided at a second position. A conductor is connected to the first piezoelectric elements. Conductors are connected to the second piezoelectric elements, respectively. A measurement device includes a vibration signal generation unit which supplies vibration signals to the second piezoelectric elements, a vibration measurement unit which detects vibration generated at the suspension, and a ground connection unit. The conductor electrically connected to the first piezoelectric elements is connected to a ground via a resistor of a ground connection unit.

A head gimbal assembly with a gimbal having a base portion and a tongue that are connected by a neck portion, wherein the tongue includes a first lateral side and a second lateral side opposing the first lateral side, first and second struts connected to the base portion, and a distal portion extending from distal ends of the first and second struts toward the tongue. First and second aft tethers have first ends connected to the first and second lateral sides respectively, and second ends connected to the distal portion. First and second fore tethers have first ends connected to the first and second lateral sides respectively, and second ends connected to the first and second struts respectively. A circuit is mounted on the gimbal. The slider is mounted on the tongue and electrically connected to the circuit.

The present embodiments relate to a near-field transducer (NFT) for a hard disk drive write head with a parabolic waveguide blocker. The waveguide blocker can include a parabolic curved surface in a center portion of a first side of the waveguide blocker and a first side comprising a slope angle of between 10-90 degrees. The waveguide blocker can be configured to reduce electromagnetic radiation from the waveguide core and recycle a scattering field emitting from the NFT to mitigate a thermal background in a recording medium and improve a thermal gradient to increase an area density capacity (ADC) of the hard disk drive write head.

Disks for use in hard disk drives (HDD) or other magnetic recording apparatus. The disks are configured based on a finding that internal stress within a disk can make the disk more resistant to shock forces. In one example, a disk is provided that has a substrate with a thickness of no more than 0.5 millimeters and an internal stress no less than 300 megapascals. The relatively high internal stress within the substrate of the disk serves to reduce the magnitude of deflections caused by mechanical shocks to an HDD in which the disk is installed, as compared to other disks of equal thickness but with relatively less internal stress. Multi-platter stacks of the disks are described. Methods are also described for fabricating such disks and for rejecting disks that do not meet certain internal stress-based criteria. Substrates are also described.

To improve a thermal gradient of a near-field transducer (NFT) and increase an areal density capacity of a HAMR head.SOLUTION: An NFT includes a main pole (MP) 302, a two-layer transducer 304 positioned adjacent to the MP, a waveguide core 306, and a parabolic waveguide blocker 308 positioned adjacent to the waveguide core, wherein the parabolic waveguide blocker includes a parabolic shape having a surface exposed to an air-bearing surface (ABS) of a write head. The parabolic waveguide blocker reduces electromagnetic radiation from the waveguide core, recycles a scattering field emitted from the NFT to mitigate a thermal background in a recording medium, improves a thermal gradient, and increases an areal density capacity (ADC) of a hard disk drive write head.SELECTED DRAWING: Figure 3A

This invention provides an information processing device that enables normal operation even when the ambient temperature is outside the operating temperature specifications of the electronic devices that constitute the information processing device. [Solution] The information processing device of this embodiment includes a hard disk drive storing an operating system. This information processing device includes a temperature sensor positioned to detect the ambient temperature around the hard disk drive, a temperature acquisition unit that acquires the temperature detected by the temperature sensor in response to power-on, and a temperature determination unit that determines whether the detected temperature is above a predetermined threshold, starts the operating system if the detected temperature is above the threshold, and does not start the operating system if the detected temperature is below the threshold, and repeats the determination at regular time intervals.

Improve non-repetitive runout (NRRO) associated with the system's structural dynamics and operating vibrations. [Solution] A data storage device such as a hard disk drive (HDD) includes a rotary pivot bearing assembly of a rotary actuator configured with a bearing span smaller than the maximum available bearing span, thereby reducing the rotary pivot tilt (PT) gain of the corresponding acoustic transfer function relative to the rotational pivot tilt (PT) gain of the original acoustic transfer function corresponding to the maximum available bearing span. To counteract the resulting decrease in coil torsion and rotational pivot tilt frequency, the voice coil is thickened vertically to increase the coil torsion (CT) frequency and rotational pivot tilt frequency, bringing them closer to their values ​​in the original acoustic transfer function. Combining a relatively short bearing span with a relatively thick voice coil ensures and improves performance by maintaining relatively high CT and PT frequencies while guaranteeing a relatively low PT gain.

The present embodiments can generally provide a magnetic write head structure with optimized gap current distribution to maximize the current-assisted areal density capacity (ADC) gain in hard-disk-drive storage devices. In a first example embodiment, a non-dual-write-shield (nDWS) write head can include a main pole (MP), a trailing shield (TS), and a write gap (WG) disposed between the MP and the TS. The write head can also include a side shield (SS), a leading shield (LS), and a write shield (WS). The write head can include a side gap (SG) between the MP and the SS on both sides of the MP tip, and a leading gap (LG) between the MP and the LS. The write head can also include a coil wrapped around the MP through a PP3 shield that is configured to direct a time-dependent write current to saturate magnetization of the MP.

A hard disk drive enclosure base includes a main base composed of a first material and having at least one bottom opening therethrough, a base insert composed of a second material having a higher Young's modulus than the first material and inserted into a corresponding opening of the main base, and a friction stir weld (FSW) coupling the base insert to the main base. The base may further include a thin film sealing material between a base insert flange and the main base, which is heated by way of the FSW process and further hermetically seals the interface between the base insert and the main base. Such a base insert may be used to support with additional stiffness the spindle motor assembly and / or the actuator assembly, and provides for increasing the number of disks while maintaining sufficient rigidity in a standard form factor drive while maintaining a hermetically-sealed enclosure.

Controlling a shingled magnetic recording (SMR) hard drive involves attempting a sequential write to a first sector of a sequence of sectors and, responsive to encountering a write inhibit boundary corresponding to the first sector, continuing the write to the next available sector in the sequence of sectors for the write. Thus, instead of that write inhibit triggering a hard error, the data is adaptively written to the next down-track physical sector possible, i.e., “sliding” to the next sector. This does not require an additional disk revolution thus there is negligible performance penalty. The write may be continued to the next track if necessary, and may continue through the entire zone, to maintain all the data in sequential form for performance and large block protection purposes.

An air guide and noise reduction device and a server are provided. The air guide and noise reduction device includes: an air guide tunnel, the air guide tunnel has an air inlet and an air outlet, and an area of the air inlet is less than an area of the air outlet; and a resonant cavity, wherein the resonant cavity is communicated to the air guide tunnel through a plurality of first openings, so that the resonant cavity absorbs noise propagated along the air guide tunnel through the plurality of first openings and resonates with the noise. By using this device, sound waves propagated from a fan to a surface of a hard disk drive may be filtered out and eliminated, the impact of the sound waves on performance of the hard disk drive may be reduced.

A gimbal head assembly (HGA), such as that used in a hard disk drive (HDD), comprises a load beam formed with proximal openings and a bend coupled to the load beam. The bend includes a tongue section to which a fine actuator is coupled, and the tongue section includes corner sections proximal to the fine actuator. Each opening of the load beam is shaped and positioned to overlap the corner section of the bend, preventing contact between the load beam and the corner section in response to shock events. This creates a gimbal clearance of the bend relative to the load beam, protecting the integrity of the piezoelectric fine actuator elements from, for example, non-operational shock events.

The present application discloses a data processing method, device, storage medium and electronic device. The method includes: obtaining each data input from each data node; mapping each data into a corresponding data slice according to a mapping relationship; determining the priority of the storage area, wherein the storage area includes: a solid-state drive and a hard disk drive; preferentially inputting the data stored in the data slice into multiple buffer areas in the solid-state drive, and after the occupancy rate of the buffer area of ​​the solid-state drive reaches a preset threshold, writing the remaining data to the hard disk drive. The present application solves the technical problem of serious skew in storage data caused by the access data skew phenomenon generated by multi-user, multi-task and multi-priority access flows of big data in the process of cloud computing, as well as causing hot data competition and waste of cold data storage resources.

One aspect of an information processing device according to the present invention comprises: a hard disk drive; a processing device that accesses the hard disk drive; a plurality of fan devices that cool the processing device; and a control device that controls the plurality of fan devices. The control device acquires an error rate of the hard disk drive while changing the number of rotations of the plurality of fan devices under a condition in which the average air volume of the plurality of fan devices is a first air volume, and controls the number of rotations of the plurality of fan devices on the basis of a first combination which, among combinations of the number of rotations of the plurality of fan devices, makes the error rate equal to or less than a threshold value.

Methods and systems for the extraction of magnetic material from magnet containing material, and for extraction of rare earth elements (REEs) from the magnetic material are disclosed. An exemplary system includes a milling / washing unit for magnet containing material such as end-of-life motors, hard drives, partially deconstructed motors, magnet-containing end-of-life product, or parts thereof, and outputting magnetic components by exploiting magnetic properties of ferromagnetic and paramagnetic materials in the presence and absence of electromagnetic fields in conjunction with other physical properties such as size and density. The system also includes a chemical processing unit for receiving the magnetic components to extract rare earth elements in the material. Chemical processes are disclosed for separating rare earth elements from magnetic components.

A hard disk drive comprises multiple disk media mounted on a spindle, with the outer diameter of each disk media offset relative to its inner diameter in the same direction along a rotational axis of the spindle, and a load / unload ramp positioned based on this offset to align with the outer diameters of the disk media. This mitigates the curvature of irregular disk media, such as that associated with increasingly thinner disks, by grouping similarly characterized irregular disks on a given spindle and compensating the ramp accordingly.

This invention provides a storage system and data placement method that can improve the performance of a storage system by efficiently operating multiple backend drives. [Solution] The storage system is constructed by having multiple storage nodes, each of which includes a storage control unit and is allocated multiple drives. The storage control unit reads and writes data to physical chunks in response to I / O requests from the host device. A drive has multiple physical chunks that are divided to store data. The storage control unit monitors the drive utilization rate for each of the multiple drives and, based on the drive utilization rates of the multiple drives, performs data relocation, moving data located in the physical chunks of the source drive to the physical chunks of the destination drive in order to equalize the drive utilization rates of the multiple drives.

A hard disk drive includes a heat-assisted magnetic recording head and an enclosure. The enclosure is configured to contain the heat-assisted magnetic recording head and other components of the hard disk drive. The enclosure includes a base and a thermally processed top cover including a thermally oxidized interior surface. Preferably, a composition of the thermally oxidized surface of the thermally processed top cover comprises at least 5 percent oxygen. More preferably, an average oxidation depth of the thermally oxidized surface of the thermally processed top cover is at least 8 nanometers.

A write pole of a write head of a hard disk drive can be manufactured by forming a photoresist layer over a magnetic material layer located over a substrate, disposing a tri-tone lithographic mask over the photoresist layer, lithographically exposing the photoresist layer through the lithographic mask, developing the photoresist layer to form a patterned photoresist layer, and patterning the magnetic material layer into the write pole by removing portions of the magnetic material layer that are not covered by the photoresist layer. The tri-tone lithographic mask includes a patterned opaque material layer and a patterned partially-transparent material layer located over a transparent substrate. The patterned opaque material layer includes a uniform width region and a flare region. The patterned partially-transparent material layer includes a pair of partially-transparent strips extending adjacent to a respective edge of the patterned opaque material layer, and partially-transparent assist bars.

A rack mountable enclosure may be suitable for mounting and enclosing electrical equipment, including electronic servers. The enclosure may include a locking bezel to cover and protect user accessible features from tampering. The enclosure may also include removeable hard-disk drive carriers and latching mechanisms.

A carrier for use in a polishing machine and a method for using the carrier during the polishing of glass substrate disks intended for use in the hard disk media of a hard disk drive. Grooves are provided in top and bottom surfaces of the carrier to, e.g., increase the flow of polishing slurry between the carrier and a pair of upper and lower polishing pads of the polishing machine during a polishing operation. Opposing grooves within the top and bottom surfaces of the carrier may be staggered or offset relative to one another. Slurry passage holes may be provided in the carrier that intersect with the grooves to allow for the passage of slurry into the grooves during polishing. Method and apparatus examples are described.

A trace gimbal is described herein. In some embodiments, the trace gimbal includes outer struts including a front outrigger at a distal end of the trace gimbal and a rear outrigger at a proximal end of the trace gimbal. The front outrigger includes a distal front outrigger and a proximal front outrigger, and the rear outrigger includes a distal rear outrigger and a proximal rear outrigger. The trace gimbal further includes a middle strut extending in a width direction of the trace gimbal and adjoining the proximal front outrigger to the rear outrigger, and an inner strut connecting the middle strut to a slider tongue. The inner strut includes a slot, and the inner strut and the middle strut adjoin the outer gimbal struts to the slider tongue.

A data storage device, such as a hard disk drive (HDD), incorporates a rotatable actuator-rotary bearing assembly with a rotary drive configured with a bearing spacing smaller than the maximum available bearing spacing. This reduces the pivot-tilt gain of a corresponding acoustic transfer function relative to the pivot-tilt gain (PT gain) of an original acoustic transfer function equal to the maximum available bearing spacing. To counteract the resulting reductions in the coil torsion and pivot frequencies, the voice coil is vertically thickened to increase the coil torsion frequency (CT frequency) and pivot frequency, bringing them closer to their values ​​in the original acoustic transfer function.By combining a relatively short bearing spacing with a relatively thick voice coil, relatively high CT and PT frequencies are maintained while ensuring a relatively low PT gain, thereby improving the structural dynamics of the system and the NRRO associated with operational vibrations.

The invention discloses a light source unit which is applied to a heat-assisted magnetic head, a welding layer and a stop structure are arranged between a sliding block of the heat-assisted magnetic head and the light source unit, and when the light source unit is connected with the sliding block, the light source unit can move along with melting of the welding layer and is accurately limited at a preset position by the stop structure. The emission port of the light source unit can be accurately aligned with the waveguide, so that the optical coupling efficiency between the light source unit and the waveguide is improved. Meanwhile, the embodiment of the invention also correspondingly provides a heat-assisted magnetic head, a magnetic head gimbal assembly and a hard disk drive.

The application relates to the technical field of data cache reading, and provides a method, a system and equipment based on a solid state disk and memory reading cache, which comprises the following steps: receiving a reading request, searching whether data corresponding to the reading request has been pre-read onto a solid state disk; when the data corresponding to the reading request has not been pre-read onto the solid state disk, judging whether data pre-reading can be triggered according to a reading record tree; when the data pre-reading can be triggered, pre-reading data corresponding to a value from a hard disk drive according to a reaching rate of the reading request; setting a corresponding trigger distance value according to the reaching rate of the reading request, and storing the pre-read data in layers according to the set trigger distance value. The application can realize efficient utilization of limited cache space, effectively reduce read-write conflicts by optimizing a data storage strategy, significantly improve the performance of an SSD medium, improve the access efficiency and response speed of a storage system as a whole, and provide a user with a faster and more stable data reading experience.