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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 8125729 | Disk drive and error-recovery processing method A disk drive. The disk drive includes a head, a motion mechanism, and a controller. The head is configured to access a disk configured to store data. The motion mechanism is configured to move the head. The controller is configured to determine a seek direction when... | 02/28/2012 |
| 8089720 | Hard-disk drive A hard-disk drive. The hard-disk drive includes a magnetic-recording disk in which tracks adjacent to each other are magnetically separated, a spindle motor which drives the magnetic-recording disk, a magnetic-recording head equipped with write element and read elem... | 01/03/2012 |
| 7710683 | Multi-arm disk drive system having interleaved read/write operations and method of controlling same A hard disk drive system that includes one or more rotating data storage platters, a drive controller and multiple actuator assemblies and corresponding respective read/write heads. The actuator assemblies are separately moveable for performing separate data seeks. ... | 05/04/2010 |
| 7486471 | Methods and apparatus for constraining transducer velocity based on disk rotational latency while seeking in a disk drive Methods of controlling seeking of a transducer that is adjacent to a rotatable disk in a disk drive include determining an expected seek time associated with moving the transducer from an initial track to a target track on the disk. An expected rotational latency ti... | 02/03/2009 |
| 7477477 | Hard disk drive and command execution method There is provided with command execution method, including; detecting a use situation of a non-volatile memory; selecting, when the use situation is low, the command which enables the disk head to be located at a start position of writing or reading most rapidly fro... | 01/13/2009 |
| 7457077 | Method and apparatus for optimally write reordering A method and apparatus to perform write reordering. The method includes extracting a seek time table containing seek times corresponding to a desired seek speed among different seek times to a surface of a disk, and reordering an order to write a data in a plurality... | 11/25/2008 |
| 7430093 | Seek control method of hard disk drive, recording medium storing method and hard disk drive adopting method The present invention relates to a hard disk drive performing a seek control method using a multi-sinusoidal wave acceleration profile, where the seek control method is capable of coping with a variation in a voice coil motor driving current due to variances in a pe... | 09/30/2008 |
| 7375917 | Idle seek calibration method for magnetic disk drive and magnetic disk drive with an intermission calibration When an idle seek operation of a magnetic disk drive is executed under a velocity control utilizing a back electromotive force of a VCM actuator, the accuracy of the velocity control is deteriorated due to temperature variation of the VCM. To eliminate this disadvan... | 05/20/2008 |
| 7312955 | Disk drive piezoelectric actuator with coupling portion extending across a slit between flexible substrates A piezoelectric actuator with a reinforced bending mode to suppress bending resonance caused by extension/contraction movements of the piezoelectric actuator and a disk drive using the piezoelectric actuator are provided. A flexible substrate is separated by a slit.... | 12/25/2007 |
| 7298572 | Fly height adjusted sweep cycle for a disc drive A method of reducing read/write head wear and disc wear through controlling fly height of the read/write head to improve reliability of a disc drive is disclosed. Absent data transfer operations, a fly height adjusted sweep cycle routine executes a sweep cycle sub-r... | 11/20/2007 |
| 7295395 | Sensing a prior transducer position by a motion pattern A motion pattern of an actuator supporting a head is monitored during/after a disc spin-up. The monitor's signal is configured to generate a digital indication of where the head was just before the spin-up. The digital indication is optionally a single-bit indicator... | 11/13/2007 |
| 7295396 | Magnetic disk drive Embodiments of the present invention reduce noise and residual vibration during random access operation of a magnetic disk drive. The magnetic disk drive which executes each instruction from an upper device to move a magnetic head from a start track to an end track ... | 11/13/2007 |
| 7287315 | Apparatus for measuring slider mounting position in magnetic head, and magnetic head manufacturing system using the measurement apparatus The present invention provides a measurement apparatus for obtaining a suitable position on a suspension where a more miniature magnetic head slider is to be mounted to the suspension, the apparatus including a front camera having a photographing optical axis within... | 10/30/2007 |
| 7280309 | Access performance adjusting method and storage apparatus An access performance adjusting method is adapted to a storage apparatus having a storage to prestore a skew quantity that is used to shift a data write starting position of each track of a recording medium depending on a head moving time required to move a head fro... | 10/09/2007 |
| 7265516 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 09/04/2007 |
| 7209310 | Disk drive identifying starting track by performing multiple load operations A disk drive is disclosed comprising a disk having a plurality of servo sectors defining a plurality of servo tracks, wherein each servo sector comprises a track address identifying a corresponding servo track. A head is actuated over the disk, and a ramp is positio... | 04/24/2007 |
| 7208898 | Near time-optimal jerk trajectory for positioning a control object Method and apparatus for control object manipulation from an initial position to a final position. A jerk control profile describes a near time-optimal jerk trajectory for the control object and includes a sequence of first, second and third sinusoidal pulses of res... | 04/24/2007 |
| 7203029 | Method and apparatus for controlling track seek servo of disk drive A method and apparatus for controlling a track seek servo of a disk drive. The method of controlling the track seek servo of the disk drive having a transducer and a disk with a plurality of tracks, includes moving a transducer to a space over a target track of the ... | 04/10/2007 |
| 7158340 | Magnetic recording and reproducing apparatus and magnetic recording medium The burst pattern shape in a discrete medium is set to a shape (truncated quadrangular pyramid shape) having substantially trapezoidal shapes in a track width direction and in a track circumferential direction, respectively, and a predetermined relationship is satis... | 01/02/2007 |
| 7149044 | Methods, apparatus and computer program products for writing tracks on a disk based on an available stroke Track pitch for writing tracks on a disk is determined based on an available stroke across the disk. The available stroke is identified by searching across the disk for where information can be written and read. The track pitch is determined for writing tracks on th... | 12/12/2006 |
| 7123435 | Method and apparatus for overwriting data in a disk drive A method and apparatus for overwriting data in a disk drive is provided. In one embodiment, a disk drive includes a disk surface and a write head associated therewith. The disk surface has servo information and user data written thereon. The user data is written by ... | 10/17/2006 |
| 7120726 | Virtual track for serpentine track format A method of representing a serpentine track accessing format includes obtaining a plurality of head and physical track number pairs in the serpentine track accessing format. Then, each of the head and physical track number pairs are mapped to a unique virtual track ... | 10/10/2006 |
| 7119984 | Method and apparatus for a laser-welded disk drive housing The present invention provides methods for laser sealing of disk drive housings. In addition, laser sealed housings are provided. Laser sealing of hard drives, allows for the disk drive assembly to be maintained in an inert gas environment. ... | 10/10/2006 |
| 7113363 | Seek error retry method of a disk device and disk device In a disk device having a ramp-load mechanism, stable retry operation is performed even upon occurrence of seek errors. A disk device is provided with a ramp to which the head is retracted from the disk, at the time of seek error retry, prior to beginning seek retry... | 09/26/2006 |
| 7110214 | Disk drive to implement a seek operation utilizing a deceleration velocity profile that mathematically models BEMFs Disclosed is a disk drive including an actuator having a coil, a head attached to the actuator, and a disk including at least a first track and a second track, and a processor for controlling operations in the disk drive including a seek operation from the first tra... | 09/19/2006 |
| 7099106 | Deceleration of head in disc drive according to a desired deceleration profile A head of a disc drive is decelerated after being accelerated, according to a desired deceleration profile for minimizing damage to the head. The desired deceleration profile is determined from an acceleration profile used for accelerating the head before decelerati... | 08/29/2006 |
| 7061714 | Disk drive modifying estimated seek times for a rotational position optimization algorithm based on change in estimated seek time parameter A disk drive is disclosed comprising a disk, a head, and a voice coil motor (VCM) for actuating the head over the disk. The disk drive executes a rotational position optimization (RPO) algorithm to select a next command to execute relative to an estimated seek time ... | 06/13/2006 |
| 7035961 | Physical zone table for use with surface-based serpentine format A system and method for accessing data stored on surfaces of discs in a disc drive utilizing more than one serpent per recording zone. The serpents are traversed using a defect descriptor table and one or more physical zone tables (PZTs). An Address Translation Logi... | 04/25/2006 |
| 7023653 | Floppy disk apparatus A floppy disk apparatus improves power efficiency and quietness by commencing rotation of a stepping motor in a smooth fashion. The floppy disk apparatus includes an interface control circuit that outputs, in accordance with an instruction from a host apparatus, a f... | 04/04/2006 |
| 7019927 | Information signal recording and playback method and apparatus therefor In an apparatus for recording and reproducing a burst-like digital information signal, a method capable of predicting the time of occurrence of a header indicating the head of the first data of a digital information signal during its reproduction from a recording me... | 03/28/2006 |
| 7002762 | Method for intersymbol interference removal in data recovery In recovering data originally written on a carrier of magnetic media after a catastrophic failure, data may be read without prior knowledge of the write channel by which the data was originally written and in the presence of intersymbol interference of the readback ... | 02/21/2006 |
| 6995935 | Methods for detecting multiple occurrences of a SAM pattern to thereby improve servo-demodulation robustness Methods are provided for improving servo-demodulation robustness. Multiple occurrences of a SAM pattern are searched for in a single servo wedge. Each detection of the SAM pattern in the servo wedge is charactered as a good SAM detection or a bad SAM detection. If m... | 02/07/2006 |
| 6980386 | Apparatus and method for writing data to an information storage disc A disc drive has transducers supported by an actuator to fly proximate data tracks on surfaces of rotating information storage discs. Each of the discs is partitioned into concentric regions. A control system arranges the deposition of data in write operations to th... | 12/27/2005 |
| 6977794 | Asymmetric seek velocity profile to improve power failure reliability for rigid disk drive with ramp A disk drive having a control system which adjusts seek velocity profiles is disclosed. The seek velocity profile is adjusted based on the direction of the seek and the location of the target track. If the seek is away from the ramp, the seek velocity profile is not... | 12/20/2005 |
| 6967811 | Disk drive having first and second seek operating modes for controlling voice coil motor temperature rise A disk drive comprising a first seek operating mode to move the actuator over a seek distance D in a seek time T1, using a first seek profile for minimizing T1, wherein for a first repetitive series of seeks over distance D a servo control syst... | 11/22/2005 |
| 6950264 | Disk drive system for controlling seek operations In a disk drive system, a data transducer control during a seek operation is based on the distance to be traversed. Acceleration of a motor coupled to the head initiates movement of the head. Deceleration of the motor is initiated based on the distance traversed by ... | 09/27/2005 |
| 6930849 | Disk drive unit, controller for actuator, and method for controlling hard disk drive and disk drive unit In a hard disk drive where data is read from and written to a magnetic disk by a magnetic head in accordance with a command from a host computer, a moving distance of the magnetic head in a radial direction is detected within a predetermined period of time. The magn... | 08/16/2005 |
| 6927935 | Method and apparatus for head positioning using servo control in a disk drive There is disclosed a disk drive using a disk medium in which a non-servo range exists. In order to position a head at a target track, a CPU executes a seek operation by normal velocity control using servo data. At this positioning, when the head passes the non-servo... | 08/09/2005 |
| 6917490 | System and method for storing information in a disk drive An information handling system includes a processor and a disk drive coupled to receive information from the processor. The disk drive is configured to write the information to a first location on a platter. The disk drive is further configured to write the informat... | 07/12/2005 |
| 6911792 | System and method for controlling movement A system and method for controlling movement of a body includes a position-based velocity profile, at least one mover, a data processor for calculating a next position of the at least one mover using data from the position-based velocity profile and passing a next p... | 06/28/2005 |
