Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8049982 | Methods and apparatus for measuring servo address mark distance in a read channel using selective fine phase estimate Methods and apparatus are provided for measuring servo address mark distance in a read channel using selective fine phase estimates. A distance between servo address marks (SAMs) in servo data of a magnetic recording media can be computed by obtaining a count of a n... | 11/01/2011 |
| 7974033 | Pad bit injection during read operation to improve format efficiency Injecting pad bits during a read operation to improve format efficiency is disclosed. In some embodiments, a pad sequence associated with error correction is not stored in a sector on a disk. Instead, the pad sequence is merged at a read channel with data stored in ... | 07/05/2011 |
| 7535664 | Performance enhancement for tape write immediate operations A method for writing data in a tape drive is provided by the present invention. The present invention provides a method for writing data in a tape drive. The invention include allocating a blank area for transpose writing on a magnetic tap and then writing a first g... | 05/19/2009 |
| 7231042 | Signal transmission apparatus and signal transmission method Copyright of contents to be transmitted may be protected for an analog signal produced by converting a digital signal representative of the contents. A signal transmission apparatus determines whether the contents are protected by copyright by detecting copyright pr... | 06/12/2007 |
| 7218468 | Writing synchronized data to magnetic tape Synchronized data is written to magnetic tape while reducing the number of backhitches. A controller detects a pattern of synchronizing events for received data records to be written to tape; writes each transaction of data records to the magnetic; tape; accumulates... | 05/15/2007 |
| 7177112 | Initial learn of adaptive feedforward coefficients The present invention reduces the time required for coefficient convergence and thus improves time-to-ready. To that end, the present invention provides an initial learn—preferably non-zero—coefficient. The initial learn coefficient is based on a translation of ... | 02/13/2007 |
| 7170702 | Servo band recorded magnetic tape, manufacturing method of the same, servo band writer and servo band writing method The present invention provides servo band recorded magnetic tapes, manufacturing method of the tapes, servo band writers and servo band Writing method. The background magnetic flux transition zone is generated with one directional polarization of the magnetization a... | 01/30/2007 |
| 7154695 | System and method for controlling the speed of a tape drive A control system and method for operating a system comprising a host computer, a buffer, a tape drive and a tape is provided. The method includes writing data to the tape while the tape is traveling at a first speed; stopping the tape; determining an optimum second ... | 12/26/2006 |
| 7136347 | Control information recording method and apparatus, information recording method and apparatus, and information record medium By the control information recording method, control information to control at least one of recording and reproducing operations of record information on an information record medium is recorded onto a guide track of the information record medium. The control inform... | 11/14/2006 |
| 7072131 | Water marking in a data interval gap A storage device in which file data is divided into multiple blocks for storage on a recording medium. The storage device includes an additional data storing section for storing additional data to be recorded on the recording medium in association with the data to b... | 07/04/2006 |
| 7061704 | Techniques for detecting polarity reversals of a disk drive read/write head Techniques are provided for detecting and correcting polarity reversals in signals generated by read/write heads that are used to read magnetic data. Directional patterns are stored in regions of each data track. The directional patterns are used to indicate whether... | 06/13/2006 |
| 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 |
| 6975693 | Approximating signal power and noise power in a system An electronic system with power approximation for circuit savings. Power approximation is provided by means for generating an absolute value of a real part of a signal, means for generating an absolute value of an imaginary part of the signal, means for generating a... | 12/13/2005 |
| 6947241 | Pre-block ID mark for multi-directional block location when using a unidirectional coding format An asynchronous method for locating individual blocks of data in a tape drive, without having to read the blocks of data is provided. The invention comprises placing an ID mark adjacent to the data blocks and inter-block gaps on the tape. The ID mark contains a smal... | 09/20/2005 |
| 6943974 | Storage device, program for controlling storage device, method for controlling storage device and recording medium A method and system for rewriting data on a tape when an error occurs during an initial write operation. When the initial write error occurs, the data is rewritten at a location that is a pre-defined block gap distance from the last valid write location on the tape.... | 09/13/2005 |
| 6900955 | Method and apparatus providing variable spin pad lengths A data storage device includes a track layout having three data sections. A first spin pad having a first length is located between a first and second data section. A second spin pad having a length that is different from the first length is located between the seco... | 05/31/2005 |
| 6751035 | Method and system for initializing patterned media A patterned media having recordable and non-recordable regions is initialized by first erasing (e.g. DC magnetizing) at least a portion of the recordable regions. At least one offset may then be determined. The at least one offset may compensate for a read to write ... | 06/15/2004 |
| 6748079 | Method and system for recording data on and reading data from an optical medium Accordingly, an improved method for recording data on an optical medium is disclosed which includes receiving and encoding a first set of data frames by a CIRC encoder to generate a second set of data frames. A control byte is then added to each of the second set of... | 06/08/2004 |
| 6715033 | Method of and apparatus for tracking appended data on storage medium A sequence of data blocks written onto a medium of a data storage system includes first and subsequent appended data blocks having an append point code for identifying the first appended data block location. For data blocks having a running block number or frame num... | 03/30/2004 |
| 6678106 | Determining data sector splits across servo bursts in a disc drive A method and system for determining data sector splits across servo bursts in a disc drive having a data disc with an embedded servo configuration. The disc drive includes a data transducer selectively positionable over the data disc for transferring data... | 01/13/2004 |
| 6650493 | Pulsed write current adapted for use with a field maintenance current in a data storage device An apparatus and method for writing data to a magnetizable recording medium in the form of spaced-apart magnetic flux transitions forming magnetization vectors having alternating magnetic orientations and selected lengths. A write element adjacent the med... | 11/18/2003 |
| 6611391 | Variable format timing runout compensation A method and system of identifying and compensating for the cumulative effect of once per revolution, OPR, timing errors by modulating the size of an inter-sector runout (ISR) field between servo sectors. The ISR field is part of an inter-sector gap (ISG)... | 08/26/2003 |
| 6608730 | Appended data recording on magnetic tape Reducing the gap distance between existing data and appended blocks increases the information density written onto magnetic tape. A narrow gap spacing may be achieved by reading the existing block of data with a read module leading the write module in the... | 08/19/2003 |
| 6577462 | Method and device for recording and reproducing data The actual data recording area on a recording medium is expanded by reducing a gap area between blocks of data for compensating for a delay time of data conversion while recording and reproducing data in a data recording and reproducing device. Based on a... | 06/10/2003 |
| 6526482 | Method of and apparatus for tracking appended data on storage medium In a data storage system in which a sequence of data blocks is written onto a medium, appended data is distinguished by including in the first and subsequent appended data blocks an append point code uniquely identifying the location of the first appended... | 02/25/2003 |
| 6233649 | Digital signal reproducing method A method of reproducing digital signals recorded on a disk having first and second recording surfaces. The digital signals are in the form of a data frame including a lead-in block and n data blocks. The lead-in block has a same format as the n data block... | 05/15/2001 |
| 6172838 | Disk unit creating a position sensitivity correction value using positive and negative cross points values of two-phase servo signals An actuator is provided with a step so as to allow FPC mounting surfaces of a read/write FPC band and of a relay FPC to be level with each other. Pointer information P4 in a ROM table is used to refer to a RAM table to acquire offset correction data. On-t... | 01/09/2001 |
| 6118605 | System for gap positioning optimization in a tape drive The system for gap positioning optimization in a tape drive takes advantage of the presence of a pair of read heads, located one on either side of the write head, to precisely determine the boundary between the inter-block gap and the data blocks adjoinin... | 09/12/2000 |
| 6088177 | Formatting apparatus and a flexible disk An apparatus and formatting method formats a disk without using an index pulse generated by hardware for every disk rotation. A last data block gap and a track gap which are longer than a standard track gap length are first written. Even if there is a flu... | 07/11/2000 |
| 6088178 | Magnetic recording and reproducing apparatus An apparatus for recording and reproducing a signal using a thin film magnetic tape as a medium and using ring type magnetic heads for recording and reproducing the signal, wherein the gap length of the magnetic head for reproducing is larger than the gap... | 07/11/2000 |
| 6072649 | Constant density recording method and system for headless format in hard disc driver A method of and a system for efficiently using split information stored in an unnecessary data sector, thereby reducing unnecessary data. The system includes first registers respectively adapted to store MCDR values in response to a write control signal g... | 06/06/2000 |
| 5982728 | Reading information from a disk-shaped recording medium that is rotatable at a plurality of speeds A reproducing apparatus for disk-shaped recording medium rotationally drives the disk-shaped recording medium at a particular speed to read information from a recording track disposed circumferentially to the center of the recording surface with informati... | 11/09/1999 |
| 5903909 | Method and arrangement for storing on tape information produced by a switching exchange system A method and arrangement for storing on tape information produced by a switching exchange system, by reading data into an intermediate file for increasing the number of records to be stored to an amount suitable for the capacity of the recorder used; copy... | 05/11/1999 |
| 5872667 | Mechanical operations and volume format identifying system zones for tape media There is described a tape format and a method for formatting a length of magnetic tape with a number of system zones. Each system zone contains an area for mechanical load/unload operations or threading operations and an area containing volume format info... | 02/16/1999 |
| 5841602 | PRML regenerating apparatus Disclosed is a PRML regenerating apparatus for regenerating a signal read by a head from a storage medium. This PRML regenerating apparatus has a waveform equalizing circuit for waveform-equalizing the read signal, a maximum-likelihood decoder for maximum... | 11/24/1998 |
| 5796534 | Apparatus which performs an ID operation simultaneously with a servo operation using a data recording medium with the ID area recorded immediately before the servo area To increase the recording capacity of a magnetic disc, tracks of this magnetic disc are divided into a number of sectors, with each sector being formed from a number of segments. Each segment is basically made up of a data region and a servo region with d... | 08/18/1998 |
| 5784216 | Method and apparatus for recording defective track identification information in a disk drive An apparatus and a method for operating a disk drive are described where defect information is written in a field other than an identification (ID) or header field in a data sector. Rather, defect information is written to a field, preferably an unused fi... | 07/21/1998 |
| 5757575 | Track-curvature detection using clock phase shift in azimuth recording A servomechanism for controlling the position of a magnetic-tape playback head (16) with respect to a track (24) of digital data on a magnetic tape (22) positions the head by reference to an error signal that error-signal-generation circuitry (FIG. 10). g... | 05/26/1998 |
| 5745313 | Method and apparatus for expanding data storage capacity on a floppy diskette A method and apparatus for maximizing the data storage capacity of a floppy diskette. The present invention provides a format that reduces the inter-sector gap between adjacent sectors on each track to eight bytes. The storage space gained from the reduct... | 04/28/1998 |
| 5742443 | Method and apparatus for data placement of continuous media to utilize bandwidth efficiency An improved method is disclosed for placing continuous media data in a memory storage disk that will increase the disk operating efficiency and increase the number of users in a service round. The memory storage disk contains a plurality of tracks each tr... | 04/21/1998 |
