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| Number | Title | Issue Date |
| 5805919 | Method and system for interleaving the distribution of data segments from different logical volumes on a single physical drive A physical drive divided into at least two logical volumes, each volume containing a plurality of data storage segments, at least some of the data storage segments in one volume being physically interleaved with at least some of the data storage segments ... | 09/08/1998 |
| 5793566 | Self securing compliant gasket for a disk drive assembly housing A novel self-securing sealing gasket for a disk drive assembly housing ensures predictable securement of the sealing gasket to a mounting surface. Elastomeric material is preferably molded to a rigid frame. The elastomeric material defines the sealing mem... | 08/11/1998 |
| 5537264 | Method for optimally selecting media transfer rates for different data heads based on individual data head performance A method for increasing data storage on a hard disk drive is disclosed herein, the method including determining a capacity goal for the disk drive, partitioning the usable disk surface on the disk drive into regions, and calculating a transfer rate based ... | 07/16/1996 |
| 5523899 | Method and apparatus for thermal calibration of hard disk drive A method and apparatus for optimizing positional data for use in connection with a hard disk type magnetic memory storage device. The apparatus includes a pattern encoded on a dedicated track of the hard disk including first and second set of signals repe... | 06/04/1996 |
| 5519435 | Multi-user, on-demand video storage and retrieval system including video signature computation for preventing excessive instantaneous server data rate A plurality of movies are distributively stored in digitally encoded form on a mass storage unit such as a Redundant Array of Inexpensive Drives (RAID) disk drive array such that they can be viewed on demand by multiple users. A video server receives movi... | 05/21/1996 |
| 5510939 | Disk drive with adaptive positioning A disk drive system with adaptive positioning employs one or more storage disks for recording data, one or more read and write heads for performing input/output operation on the disks, with at least one of the heads being used as a servo head, a head-posi... | 04/23/1996 |
| 5455726 | Versatile head positioner stop A versatile head positioner stop is provided which bi-directionally limits movement of a head positioning device in a Winchester hard disk drive system. The head positioner stop cushions the impact of the head positioner when it reaches predetermined limi... | 10/03/1995 |
| 5414577 | Magnetically coupled hard disk drive head positioner latch A fail-safe, magnetically coupled head positioner latch assembly for a Winchester-type disk drive comprises a rotatably mounted latch member including an outwardly extending latch arm and tang, and a solenoid assembly. The latch arm is adapted for engagin... | 05/09/1995 |
| 5404258 | Hard disk drive precision head positioner having a self-aligning head positioner/magnetic coil bobbin interface A precision magnetic head positioner assembly for a Winchester-type hard disk drive storage system includes a main rotatable integral head positioner body and an integral magnetic coil assembly. The positioner body includes outwardly extending integral he... | 04/04/1995 |
| 5268805 | Low inertia Winchester disk drive actuator The head positioner for a Winchester type hard disk drive digital storage system includes a main rotating metal body portion made of magnesium or other lightweight metal and having outwardly extending, integral, head positioning arms. The shape of the arm... | 12/07/1993 |
| 5249086 | H.D.A. pulse shaping system using a differential delay line with multiple inputs A system for slimming pulses which represent the data stored in a hard disk drive assembly. The pulse slimming system comprises a delay line with the pulse applied in one polarity to a central tap. The same pulse is applied in the opposite polarity to tap... | 09/28/1993 |
| 5246479 | Drive motor controller for low power disk drive A hard disk drive digital storage system provides increased power efficiency and reduced power losses by using a switching regulator type DC to DC power converter, to control spindle motor speed, in which a variable duty cycle, low "ON" resistance n-chann... | 09/21/1993 |
| 5233275 | Simplified sensorless DC motor commutation control circuit using analog timing techniques Initial start-up of a polyphase, brushless DC motor (used for a hard disk drive system) is accomplished by sequentially applying current to each of the phases of the motor. When a back EMF zero-crossing is detected in one of the phases of the motor, after... | 08/03/1993 |
| 5191584 | Mass storage array with efficient parity calculation An efficient redundant array of mass storage devices includes a plurality of hard disk drives, a controller or processor associated with each hard disk drive for calculating partial parity data and parity data, a host computer and at least one bus for com... | 03/02/1993 |
| 5162959 | Actuator lock An actuator lock to hold the disk drive positioner in the parked position after shut down includes a latch arm extending from a selected portion of the positioner, a solenoid, a locking lever and a latch. The solenoid has a coil and an armature. The armat... | 11/10/1992 |
| 5161073 | Low power disk drive spindle motor controller A hard disk drive digital storage system provides increased efficiency and reduced losses by using a switching regulator type power supply in which a variable duty cycle, low resistance n-channel field effect transistor is located near the ground side of ... | 11/03/1992 |
| 5121273 | Computer disk head interconnect assembly Magnetic data read/write apparatus is disclosed for use in connection with a magnetic data storage disk. The apparatus includes a read/write head mounted onto a positioning device along with several electrical leads that extend from the read/write head to... | 06/09/1992 |
| 5068755 | Sector pulse generator for hard disk drive assembly A sector pulse generator circuit for a hard disk drive assembly includes an angular position counter, a sector counter, a sector limit register, and a pulse generator. The circuit generates a sector pulse when the count in the angular position counter equ... | 11/26/1991 |
| 4989108 | Electro-mechanical latch An electro-mechanical latch includes a solenoid having an armature movable from a normally biased first position to a second position in response to an electrical current applied to the solenoid, and means for holding the armature in the second position t... | 01/29/1991 |
| 4967155 | Environmentally controlled media defect detection system for Winchester disk drives An environmentally controlled media defect detection system for Winchester disk drives includes a testing cabinet which is divided into two sections. The first section is maintained at an environmentally controlled elevated temperature for testing Winches... | 10/30/1990 |
| 4949201 | Disk drive head position controller with static bias compensation and plural velocity detectors A positioning system for a hard disk drive for rapidly and accurately positioning the disk head. A constant bias compensation signal is injected into the feedback loop to reduce positioning delays otherwise caused by a steady state force which is asserted... | 08/14/1990 |
| 4947093 | Shock resistant winchester disk drive A shock resistant hard disk drive system employs a plurality of magnetic disks for recording data, a plurality of magnetic heads for performing input/output operation on the magnetic disks, with at least one of the magnetic heads being used as a servo hea... | 08/07/1990 |
| 4939600 | Efficient head positioner power amplifier The power amplifier for the head positioning coil of a Winchester or hard disk drive digital storage system includes circuitry for generating complementary variable width pulses at a frequency above 100 kilohertz. The filter coupling the positive and nega... | 07/03/1990 |
| 4875117 | Digital head positioner assembly The head positioner for a Winchester type hard disk drive digital storage system includes a main rotating metal body portion having outwardly extending, integral, head positioning arms. The magnetic heads for reading and writing information on the hard di... | 10/17/1989 |
| 4870643 | Parallel drive array storage system A large capacity digital storage system includes five standard 51/4 inch Winchester disk drives, a formatter for each disk drive, and a master controller for coupling to the host computer or data processor. The spindles of the disk drives are rotated in s... | 09/26/1989 |
| 4839754 | Winchester disk drive motor circuitry An improved switching regulator power supply with a variable duty cycle is disclosed which forms part of a compact Winchester disk drive system having a storage capacity in excess of 380M bytes of information. The switching regulator is designed for frequ... | 06/13/1989 |
| 4829391 | High speed integrated charge pump circuit for phase lock loops The subject invention provides a digital Storage System such as a Winchester Hard Disk Drive System having a motorized hard disk drive assembly which interacts with a head positioner to read and write data and timing instructions onto a plurality of disks... | 05/09/1989 |
| 4803442 | Low power buffer amplifier A current amplifier is provided with three active transistors of the same polarity type, which function to amplify the input signal at a wide range of frequencies, with low power consumption and low or no output crossover distortion. One transistor, in co... | 02/07/1989 |
| 4797762 | Stress free winchester drive shaft mounting A Winchester disk drive assembly includes upper and lower mounting plates and shafts for the main drive motor assembly and for the head positioner firmly connected to both mounting plates. One end of the shafts is mounted to one of the mounting plates by ... | 01/10/1989 |
| 4797763 | Compact magnetic head flexible suspension A digital memory system of the hard or Winchester disk type, includes a series of hard disks, and pivoted mounting arms for the magnetic heads or sliders. In order to minimize the vertical, or inter-disk space occupied by the sliders and their mounting ar... | 01/10/1989 |
| 4796131 | Head positioner preloaded stop A Winchester or hard disk drive, with a head positioner rotor is provided with a bidirectional preloaded stop. The head positioner rotor is provided with a plate having two spaced stop surfaces, both of which engage a single stop, which may be in the form... | 01/03/1989 |
| 4796122 | Integral head positioner for hard disk storage system The head positioner for a Winchester type hard disk drive digital storage system includes a main rotating metal body portion having outwardly extending, integral, head positioning arms. The magnetic heads for reading and writing information on the hard di... | 01/03/1989 |
| 4754353 | Hard disk head positioner assembly A digital storage system of the Winchester or hard disk drive type has a magnetic head positioner within which the arm-positioning body, including the heads, is rotatably mounted about a fixed stator assembly which includes a two-part shaft assembly compr... | 06/28/1988 |
| 4739427 | High capacity hard disk construction A digital storage system of the Winchester or hard disk drive type has the annular, hard aluminum disks mounted coaxially around the drive motor. A central fixed aluminum shaft has the motor stator coils centrally mounted on it, and an aluminum disk mount... | 04/19/1988 |
| 4717977 | High capacity Winchester disk drive A digital storage system of the Winchester or hard disk drive type has the hard aluminum disks mounted around the drive motor. To accommodate the difference in thermal coefficients of expansion of the steel cylinder forming the outer periphery of the moto... | 01/05/1988 |
| 4317146 | Compact magnetic disk storage system A compact, high capacity rigid magnetic disk storage system includes three 8-inch disks in an assembly only 45/8 inches high complete with electronics. The system includes two separate sections, a first section containing the electronics, the disk drive ... | 02/23/1982 |
