Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 5404487 | Disc access control method for cache-embedded disc control apparatus with function-degradation capability of data transmission path A disc controller, which is connected to a plurality of channels for supplying access requests and discs. The controller includes a plurality of storage paths which control transfer of data between a cache, the channels and the discs, and a control memory... | 04/04/1995 |
| 5392290 | System and method for preventing direct access data storage system data loss from mechanical shock during write operation A secondary data storage system for a host computer system includes a disk drive system having a device controller, at least a first magnetic disk and a read/write magnetic transducer positionable with respect to a recording surface of each magnetic disk.... | 02/21/1995 |
| 5384790 | Magnetic recording system with pulse qualification and error correction circuitry Special tape drive read circuitry generally qualifies read voltage peaks by establishing a minimum amplitude for valid peaks in the read voltage signal so that noise is not interpreted as peaks, but does not require amplitude qualification during periods ... | 01/24/1995 |
| 5381424 | Method and apparatus for fault-tolerant identification of the header field of a recording device A method and apparatus for fault-tolerant identification of a particular header field of a recording device. Each one of a plurality of headers is a different value encoded into a codeword according to predetermined generator polynominal. A target codewor... | 01/10/1995 |
| 5379162 | Customized data recovery procedures selected responsive to readback errors and transducer head and disk parameters A method and apparatus are provided for data recovery in a disk drive data storage system of the type including at least one disk surface and at least one transducer head for reading and/or writing data to a respective disk surface. A plurality data recov... | 01/03/1995 |
| 5311522 | Error correction and/or detection device for product code block data An error correction and/or detection device for product code block data, applied to a digital video tape recorder of a so-called D1 or D2 format, is disclosed, in which the correction mode of the correction by the outer codes is selected and the correlati... | 05/10/1994 |
| 5287363 | System for locating and anticipating data storage media failures Method and apparatus for use in a computer having peripheral data storage, to monitor data transfers to detect defective or marginally defective storage areas. The method and apparatus are based on a memory-resident program component and a transient progr... | 02/15/1994 |
| 5255272 | Predictive tape drive error correction apparatus The error correction apparatus of this invention maintains a set of pointers which are used to supplement the error correction characters written into the data tracks of the data frame. These pointers consist of indicators stored in a memory that note the... | 10/19/1993 |
| 5243604 | On-the-fly error correction On-the-fly error correction is provided using syndromes of a codeword encoded on data storage media. First and second syndromes are generated and a variable prescaler prescales the second syndrome by a field element to produce a prescaled second syndrome ... | 09/07/1993 |
| 5237575 | Error correction coded digital data reproducing apparatus A data reproducing apparatus for reproducing main data from a disc on which a data string comprised of main data and auxiliary data appended to the main data at intervals of predetermined lengths of the main data, which main data are previously error corr... | 08/17/1993 |
| 5216677 | Data reproducing apparatus A data reproducing system is provided wherein data stored in an optical disk can be read and, in accordance with a coded error detection and correction code, can have an error pointer defined in synchronization with a modulated data of one symbol. This in... | 06/01/1993 |
| 5202979 | Storage system using multiple independently mechanically-driven storage units A storage system for data words in which error correction bits are generated for each data word and are stored independently from the data word on a separate mechanically-driven medium. In another aspect, the storage system serves a wide high throughput p... | 04/13/1993 |
| 5157670 | Error correction code interruption system Disclosed is a disk controller having an interruptable error correction code circuit for accumulating a remainder during the writing to or reading from data storage media in a disk storage device. An ECC clock latches each bit of data into the circuit whe... | 10/20/1992 |
| 5153885 | Bit error measuring apparatus A bit error measuring apparatus in which bit errors in a rewritable information recording medium are measured by reproducing data after the data have been repeatedly recorded on the medium, in which position of recording data used in random number data ge... | 10/06/1992 |
| 5151905 | Data recording method A method for recording data onto a disc-shaped recording medium having a sector construction such as an optical disc by dividing input data into predetermined lengths, respectively, two-dimensionally arranging the divided data, generating and adding error... | 09/29/1992 |
| 5128946 | Information recording-reproducing method and apparatus An information recording-reproducing method is disclosed. An error correction code of M bytes and N bytes is imparted in a vertical direction and a horizontal direction, respectively, to data of m×n bytes. A signal of (m+M)×(n+N) bytes (m, n, M and N be... | 07/07/1992 |
| 5105427 | Data storage apparatus A data storage apparatus used in a form incorporated into a computer system or the like comprises a storage medium including a multiplicity of usual data regions each of which has a predetermined capacity and in or from which usual data are to be written ... | 04/14/1992 |
| 5091909 | Method for writing/reading of data in magnetic disk subsystem When recording records into the IC memory group of a magnetic disk subsystem the records being composed of a count area of a fixed length, key area of a variable length and a data area of a variable length, data of a special format which is judged by ECC ... | 02/25/1992 |
| 5089917 | Digital signal recovery apparatus with minimized high frequency noise Apparatus for regenerating a coded digital signal, comprising an interference cancellation equalizer for cancelling an interference component from an input digital signal and a decoder. The equalizer includes a compensator for high frequency compensating ... | 02/18/1992 |
| 5087992 | Method for assigning tracks on a magnetic data storage disk to different read/write frequency zones A method for assigning tracks on a magnetic data storage disk to different zones in which data is written at selected zone frequencies so as to write data on the tracks at the maximum frequency that will limit the read/write error rate to a preselected va... | 02/11/1992 |
| 5072378 | Direct access storage device with independently stored parity A failure independent, fault tolerant Direct Access Storage Device (DASD) storage subsystem comprising a Disk Control Unit and a number of Physical Devices is provided with a parity Generator for generating a parity for system records as the system record... | 12/10/1991 |
| 5068858 | Error correction capability varied with track location on a magnetic or optical disk A method for implementing error-correcting codes for disks, wherein the statistics of error vary according to the radius of the location being accessed. A Reed-Solomon code is selected having data bytes and redundant bytes and an error-correcting capabili... | 11/26/1991 |
| 5067131 | Apparatus and method for recording and/or reproducing a digital signal An apparatus and method for recording and/or reproducing digital data employing a DAT (digitial audio tape recorder) adapted to record and/or reproduce data from a computer or the like in accordance with the DAT format. Main data is recorded in a main are... | 11/19/1991 |
| 5051998 | Data block deinterleaving and error correction system A deinterleaving and error correction system which is advantageously utilized in a playback system of an optical recording disk apparatus. As each block of sector data, encoded for example with the Reed-Solomon error correction code with block interleavin... | 09/24/1991 |
| 5023876 | Method and apparatus for detecting finally recorded sector In a finally recorded sector detecting system suitable for a write-once type optical disc device, an error correction code or error detection code provided for each index sector is utilized to detect a state of errors occurring in reproduced index signals... | 06/11/1991 |
| 4998252 | Method and apparatus for transmitting digital data Information is transmitted by a digital audio transmission line, which may include recording and playback from a digital audio disc, that includes information other than conventional two-channel audio signals and in which error correction of the data tran... | 03/05/1991 |
| 4993029 | Method and apparatus for randomizing data in a direct access storage device Data byte fields and corresponding ECC byte fields to be magnetically recorded as multi-byte records is randomized prior to run-length encoding. The randomized/encoded data is then written. When the randomized/encoded data is read back, the data is first ... | 02/12/1991 |
| 4965801 | Architectural arrangement for a SCSI disk controller integrated circuit A SCSI disk controller integrated circuit (SDC IC) provides much of the hardware necessary to perform asynchronous data transfers between a SCSI host bus and a disk interface circuit through two on-chip rotating buffers. The SDC IC is designed to be used ... | 10/23/1990 |
| 4949342 | Code error detecting method The code error detecting method uses the code error detecting apparatus which comprises a sector buffer memory for storing various kinds of data, an adder circuit for performing exclusive OR addition of data, a CRC generator/checker for producing error ch... | 08/14/1990 |
| 4897840 | Method and apparatus for controlling the error correction within a data transmission controller given data read from moving peripheral storages, particularly disk storages, of a data processing system In order to reduce the time losses that arise when reading a plurality of successive data blocks, because of the interruption of the read operation in the case of recognized data errors, all required data blocks are read in one pass and are transferred in... | 01/30/1990 |
| 4864573 | Apparatus for reproducing a pcm modulated signal, comprising a muting circuit An apparatus for reproducing a pulse-code-modulated signal comprises error-correction means (3) for correcting errors in one or more of the data words forming the pcm signal. When the error-correction means are no longer capable of correcting errors in th... | 09/05/1989 |
| 4829525 | PCM signal reproducing apparatus including error/erasure correction circuit A digital signal reproducing apparatus reproduces coded digital signal data which have been recorded on a magnetic tape. The digital signal reproducing apparatus includes first and second decoders. These decoders perform the error correction and erasure c... | 05/09/1989 |
| 4709367 | Method and apparatus for distinguishing between diskettes in a diskette drive A method and apparatus are disclosed for enabling a diskette drive system to distinguish between diskettes and verify that the diskette currently in the drive is the correct one. Each diskette contains a file allocation table for controlling the allocatio... | 11/24/1987 |
| 4604748 | Data processing system with error correction In a picture data record/playback system, picture data and code data is recorded onto two fields of a record, which fields constitute a single picture in an optical disk unit. When the picture data is subjected to a cyclic redundancy check and an error is... | 08/05/1986 |
| 4567594 | Reed-Solomon error detecting and correcting system employing pipelined processors Apparatus and methods are disclosed for providing on-line error detection and correction of errors in an optical disk storage system using Reed-Solomon decoding techniques. An implementation is employed which divides the Reed-Solomon decoding process into... | 01/28/1986 |
| 4564945 | Error-correction code for digital data on video disc Data for recordation on a video disc is given multi-redundancy at block, field and group levels. Raw data is filled typically serially row by indexed row of 8-bit words with at least one and preferably 3 words being auxiliary check words derived from the ... | 01/14/1986 |
| 4562577 | Shared encoder/decoder circuits for use with error correction codes of an optical disk system A shared encoder/decoder circuit for use with a Reed-Solomon coding scheme of an optical disk storage system. The optical disk system includes a drive adapted to permanently store data on a removable platter. Prior to recording a data byte on the platter,... | 12/31/1985 |
| 4534031 | Coded data on a record carrier and method for encoding same The coded data (12) on the record carrier (10) and the method for encoding such data (12) in tracks (14) provide a relatively simple and yet very effective means for making the data record carrier (10), and particularly the data (12) recorded thereon, hig... | 08/06/1985 |
| 4500926 | Data-recording apparatus A data recording apparatus has an optical scanner for optically scanning a document and for outputting an image signal corresponding to the document pattern, a modified Huffman coding circuit for compressing the image information output by the optical sca... | 02/19/1985 |
| 4309721 | Error coding for video disc system An improved error code used for encoding and decoding data in a video disc system of the type wherein the data format comprises a start code followed by an error code and information bits. The error code is chosen so that the error code check register in ... | 01/05/1982 |
