Abstract:
A read channel is described for use in a storage device including a storage medium (22a-d) for storing data, an interactive element (24a-h) for reading information from and writing information on the storage medium (22a-d) and a processor (35) for performing control functions in the storage device. The read channel comprises a set of electronic components (50-64) for receiving and processing information read by the interactive element from the storage medium. Each component of the set of electronic components includes an output and is coupled in a predetermined arrangement to other components of the set of electronic components. A data capture circuit (68) includes an input circuit (200) and an output circuit (202) with the intput circuit being coupled to the output of each component of the set of electronic components, and the output circuit being coupled to the input circuit to capture a signal from a preselected one of the outputs coupled to the input circuit. The output circuit (202) is adaptable to transfer the acquired signal to the processor (35).
Abstract:
The present invention relates to improved multi-layer magnetic recording media and magnetoresistive drive systems incorporating the same. In particular, multi-layer media including alternating layers of cobalt or cobalt alloys and a precious metal, such as palladium or platinum, and a process to manufacture such media, are disclosed. Media in accordance with the invention generally include a substrate, a nucleating layer, a lattice, and a protective layer. In certain embodiments, the substrate is polished aluminum. In other embodiments, the thickness of the nucleating layer is thicker than 100 ANGSTROM , and in certain embodiments between about 200 and about 600 ANGSTROM . The lattice, generally includes bilayers of cobalt (or an alloy thereof) and palladium or platinum. The thickness of the cobalt layers are between about 1.5 ANGSTROM and 10 ANGSTROM , or between about 2 ANGSTROM and 7 ANGSTROM , or between about 3 ANGSTROM and 5 ANGSTROM . The thickness of the palladium or platinum layers are between about 5 ANGSTROM and 15 ANGSTROM , or between about 7 ANGSTROM and 12 ANGSTROM , or between about 8 ANGSTROM and 11 ANGSTROM . The number of layers in the lattice (33), or its periodicity, is between about 10 and 30 or between about 15 and 25. In certain embodiments, the thickness of the lattice (33) and the nucleating layer (32) do not exceed 1500 ANGSTROM . The invention also provides a novel information storage device that includes a ring write head and a magnetoresistive (MR) read head in combination with a vertical recording media with perpendicular anisotropy exceeding 2 X 10 erg/cc and coercivity as high as 5000 Oe. Also provided is an improved MR read head. The improvement includes a physical offset in the MR element, such that the element is offset from perpendicular to the media.
Abstract:
A sub-ambient pressure, air bearing slider is disclosed for positioning a magnetic read/write head proximately to a rotating disk. The slider includes first and second rails extending along the side of the slider facing the rotating disk from a leading edge of the slider to a trailing edge of the slider. Each rail has a thigh region extending at an angle from the leading edge to a lateral side of the slider, a foot region extending at an angle from a lateral side of the slider toward the trailing edge of the slider, and a knee region at a lateral side of the slider coupled between the foot and thigh regions. Recesses are provided to shape the first and second rails. A central recess provides a volume for sub-ambient pressure. One or more tails can be placed within the central region to prevent the shifting of pressure completely to one side of the slider. The design of the first and second rails leads to a more uniform flying height for the slider and magnetic head over all tracks of the disk.
Abstract:
A disk drive including voice coil magnet plates formed integrally with the base and/or cover of the disk drive. During the fabrication process, the steel magnet plates are placed in proper position in the base and cover die casting, and then the molten aluminum is injected to form the base and cover. As result, the magnet plates are integral with the base and cover and no fluid leakage can occur around the boundary between the top magnet and cover, or around the boundary between the bottom magnet and base. Thus, the disk drive is sealed against the external environment.
Abstract:
A data buffer monitor apparatus which monitors the space availability in WRITE buffer and the number of sectors available for transfer in the READ buffer and generates the OK TO TRANSFER signal. The data buffer monitor apparatus includes a READ buffer monitor, a WRITE buffer monitor and a transfer controller. The READ buffer monitor monitors the total number of sectors stored in the READ buffer, the number of sectors in the READ buffer available for transfer to the host and generates a READ OK TO TRANSFER signal if the sectors for a requested READ operation are stored in the READ buffer. The WRITE buffer monitor monitors the total number of sectors in the WRITE buffer and generates a WRITE OK TO TRANSFER signal if the WRITE monitor determines that a requested WRITE operation can be performed. The transfer controller in response to either the READ OK TO TRANSFER signal being generated by the READ buffer monitor if a READ operation has been requested or the WRITE OK TO TRANSFER signal being generated by the WRITE buffer monitor if a WRITE operation has been requested generates an OK TO TRANSFER signal indicating the requested READ or WRITE operation transfer of sectors to and from the disk drive system may be performed by the disk drive.
Abstract translation:一种数据缓冲器监视装置,用于监视写入缓冲器中的空间可用性以及可用于在READ缓冲器中传输的扇区数,并产生OK TO TRANSFER信号。 数据缓冲器监视器装置包括读缓冲器监视器,写缓冲器监视器和传送控制器。 READ缓冲器监视器监视读缓冲器中存储的扇区总数,可用于传送到主机的READ缓冲区中的扇区数,并且如果所请求的READ操作的扇区被存储在主机中,则产生READ OK TO TRANSFER信号 读缓冲区。 WRITE缓冲区监视器监视WRITE缓冲区中的扇区总数,并且如果WRITE监视器确定可以执行所请求的WRITE操作,则产生WRITE OK TO TRANSFER信号。 如果已经请求了READ操作,或者由WRITE缓冲区监视器产生WRITE OK TO TRANSFER信号,如果请求了WRITE操作,则转移控制器响应于READ缓冲器监视器产生的READ OK TO TRANSFER信号, 可以通过磁盘驱动器来执行指示扇区到磁盘驱动器系统的请求的READ或WRITE操作传送的OK TO TRANSFER信号。
Abstract:
A disk drive including a disk clamp for clamping one or more disks within the disk drive. The clamp is comprised of a dual member construction which provides a substantially uniform contact pressure at the circular line of contact between the clamp and the disk. The clamp includes an inner ring surrounding and fixedly attached to the hub of the disk drive. The inner ring preferably does not contact the disk. An outer ring is provided having a first portion underneath the inner ring and a second portion provided axially outward from the inner ring. The second portion of the outer ring contacts the disk in a substantially circular line of contact. The inner ring further includes a plurality of threaded holes, through which a plurality of set screws are provided. The screws, when sufficiently threaded through the holes, exert a pressure on the outer ring, which pressure is uniformly transmitted to the disks to secure the disks within the drive.
Abstract:
A control system and method for controlling the speed of the spindle motor rotating disks in a disk drive system where the transducers ride or fly upon a medium, air or some other viscous substance between said disks and said transducers thereby exerting a load upon said spindle motor, said load having a non uniform profile across the disks from the inner diameter to the outer diameter of said disks where said load at any location across said disk is a function of the type of medium upon which said transducers rides or files above said disks, said location itself and the physical environment being experienced by said medium at any given instant of time. The control system comprises storage means for storing speed control data for defining the power to be applied to the spindle motor to maintain the spindle motor at a desired speed as a function of the presently selected track address and a control means for selecting the speed control data for a presently selected track address and providing the speed control data to the spindle control system such that the speed of the spindle motor is maintained at the specified speed. The method comprises the steps of a) generating speed data for maintaining the spindle motor at a specified speed as a function of the track being addressed by the disk drive system; b) storing the speed data in a first table in a memory in the disk drive system; c) retrieving the stored speed data for the track presently being addressed by the disk drive system; and d) providing the retrieved speed data to the speed control means for controlling the speed of the spindle motor.
Abstract:
A disk drive is provided for flying at low flying heights, for example 2 1/2 mu ''. The disk drive includes an adhesive-bonded slider and head suspension design which does not lose its crown or camber with a change in temperature. In a preferred embodiment, the adhesive is applied at discrete points. It was found that applying the adhesive in this manner was sufficient to securely bond the slider to the flexure tongue and resulted in relatively little change in the crown or camber geometry over a wide range of temperatures.
Abstract:
A method and apparatus including a system for recirculating liquid in a controlled environment. The apparatus comprises a wick (50) mounted in the controlled environment, a portion of the wick being in contact with the storage medium (20); a bearing liquid in the controlled environment in a quantity sufficient to maintain a determined quantity of fluid at the interface between the disk and the interactive element (22) and to saturate the wick; and a motor (26) for moving the storage means to induce capillary action of the fluid in the wick wherein such capillary action compels condensation of the liquid in the porous material of the wick. In a further aspect a method for collection of a liquid bearing material in an information storage apparatus is provided.
Abstract:
An interactive element for an information recording apparatus, the information recording apparatus having a liquid bearing lubricant between a storage medium and the interactive element which moves relative to the storage medium. In one aspect, the element includes a slider body, the slider body (70) having at least a first and second regions; and an interface element, mounted on the first region of the slider body; wherein the first region of the slider body has a substantially higher drag when moving over the liquid bearing when the interactive element is moving relative to the storage medium than the second region. In one embodiment the element is a recording head for a disk drive, the disk drive having a liquid bearing between a rotatable storage disk and the head. The recording head includes a slider body (70), the slider body having at least a first and second ends; and a transducer element, mounted on the first end of the slider body; wherein the second end of the slider body travels at a flying height which is substantially greater with respect to the disk when the disk is rotating than a flying height achieved by the first end.