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| Number | Title | Issue Date |
| 5572704 | System and method for controlling split-level caches in a multi-processor system including data loss and deadlock prevention schemes A method for preventing data loss and deadlock in a multi-processor computer system wherein at least one processor in the computer system includes a split-level cache. The split-level cache has a byte-writable first-level and a word-writable second level.... | 11/05/1996 |
| 5568650 | Control unit for controlling reading and writing of a magnetic tape unit The control unit for the magnetic tape unit compresses data and writes in a physical block unit in the buffer according to the data write instruction from the host computer or without compressing writes in a logical block unit in the buffer. And, accordin... | 10/22/1996 |
| 5564037 | Real time data migration system and method employing sparse files A system and method for real time data migration in a networked computer system uses a known operating system feature, a sparse file, to represent a migrated file. The sparse file consumes a minimum amount of physical space on the file server but is defin... | 10/08/1996 |
| 5557770 | Disk storage apparatus and method for converting random writes to sequential writes while retaining physical clustering on disk A high performance disk subsystem has a disk write mechanism that provides high throughput for random disk writes by dividing the disks into a data portion and a log portion. A fault-tolerant memory in the disk controller is used to temporarily store data... | 09/17/1996 |
| 5551008 | Method and system for resuming data processing in computer After a computer system is normally bootloaded, a resuming mode is set. When a power switch is off, a power source provides a power switch off signal. When the power switch off signal is detected and when the resuming mode flag is set, system data is stor... | 08/27/1996 |
| 5546536 | Log for selective management of specific address in a shadow storage system A log for managing data in a shadow set of storage media includes a system for maintaining a log of address information associated with at least one write command received from one of a plurality of data processing devices. The system for maintaining a lo... | 08/13/1996 |
| 5535381 | Apparatus and method for copying and restoring disk files A method and apparatus for backing up files from a logical disk are described to a backup tape and restoring all or part of the files to the logical disk. Separate "backup" and "copy" buffers in the host processor's main memory are employed during a backu... | 07/09/1996 |
| 5524205 | Methods and apparatus for optimizing undo log usage Each node in a data processing system contains at least one undo buffer and one least one redo buffer for insuring that any changes made to a section of a non-volatile storage medium, such as a disk, can be removed, if a transaction has not been committed... | 06/04/1996 |
| 5504873 | Mass data storage and retrieval system A plurality of data storage modules form a library, with a directory archive maintaining a directory of the information contained on each data storage module (file server application) or on the storage modules retained in the library (volume server applic... | 04/02/1996 |
| 5481701 | Method and apparatus for performing direct read of compressed data file In a block compressed data file, desired given non-compressed data is identified in a subset of a compressed data file and only the subset of the compressed data file containing the desired data is decompressed. Three operating modes according to applicat... | 01/02/1996 |
| 5475834 | Integration of migration level two and backup tape processing using multiple inventory entries A method and system for integrating migration level two (ML2) and backup tape processing provide for the backup, archival, and/or restoration of ML2 tape files without the use of tape mounts. In this manner, the amount of data movement required to recover... | 12/12/1995 |
| 5455946 | Method and means for archiving modifiable pages in a log based transaction management system A method and means for achieving files of modifiable pages in a log based phased commit transaction management system (TMS) in which those pages which have been modified since the last full or incremental backup donot require during the copy operation any... | 10/03/1995 |
| 5448719 | Method and apparatus for maintaining and retrieving live data in a posted write cache in case of power failure A host computer including a posted write cache for a disk drive system where the posted write cache includes battery backup to protect against potential loss of data in case of a power failure, and also including means for performing a method for determin... | 09/05/1995 |
| 5437022 | Storage controller having additional cache memory and a means for recovering from failure and reconfiguring a control unit thereof in response thereto A storage controller having additional cache memory and a system for recovering from failure and reconfiguring a control unit thereof in response thereto. The inventive controller includes a first cluster for directing data from a host computer to a stora... | 07/25/1995 |
| 5437012 | System for updating directory information and data on write once media such as an optical memory card A method and apparatus for updating data stored in a write once/read many memory which comprises creating a virtual image of data stored in the memory, updating data in the virtual image of the memory and designating updated data in the virtual image, and... | 07/25/1995 |
| 5430882 | Apparatus and method for protecting data stored in memory An apparatus and method provide data security for battery backed memory during power up and power down. A reversing sequential power up and power down process is used to control the write process for the memory during the operating voltage transitions of ... | 07/04/1995 |
| 5420996 | Data processing system having selective data save and address translation mechanism utilizing CPU idle period A main memory has a plurality of divided storage areas. A central processing unit saves data from each storage area of the main memory into an auxiliary memory during a normal operation of a computer system, and sets a flag corresponding to each storage a... | 05/30/1995 |
| 5386535 | Protected electronic mass memory unit including first and second buses of the parallel type A dual-access protected electronic mass memory unit, the various elements of which comprise a plurality of logic boards connected to at least one peripheral controller (CNT1, CNT2) of the information processing system (H) to which th... | 01/31/1995 |
| 5377342 | Method of controlling a duplex data storage system and data processing system using the same A processor module generates a data write request and sends data specified thereby to each of two data buffers respectively provided in two data storage units, each having a data storage device, such as a magnetic disc device. When the data has been compl... | 12/27/1994 |
| 5347579 | Personal computer diary A computer diary archives a diary entry by creating, time stamping, authenticating and permanently storing a reference data block along with each diary entry. An archived diary entry can only be modified by placing original text within compartment codes, ... | 09/13/1994 |
| 5341494 | Memory accessing system with an interface and memory selection unit utilizing write protect and strobe signals A memory mapping and module enabling circuit for allowing logical 128 kbyte memory blocks to be defined for any location in any module connected to a memory system. A RAM is addressed by the system address lines defining 128 kbyte blocks, with the output ... | 08/23/1994 |
| 5341493 | Disk storage system with write preservation during power failure A disk storage system including means for assuring completion of data writes to a data storage disk upon failure of electrical power receives data write commands including data to be written to one or more storage disks. Temporary memory storage temporari... | 08/23/1994 |
| 5265230 | Method and apparatus for determining sector status in a data storage device by writing a status of read-only, writable, or obliterated in an error recovery area of each sector An apparatus and method for allowing writable, magneto-optic (MO) data storage media to be defined as read-only. Because the MO media specification is compatible with WORM media, each sector of the media contains an error recovery section, called the defe... | 11/23/1993 |
| 5255381 | Mode switching for a memory system with diagnostic scan Methods and apparatus for immunizing dynamic random access memory (DRAM) modules in the data processing system against data loss from transitions that occur with memory mode switching during the scan operation and permitting normal operations to be perfor... | 10/19/1993 |
| 5249285 | RAM lock device and method for a text entry system A memory system for use in a text entry system is provided. The system includes a retentive data memory and a system for locking a portion of the retentive memory and a key for unlocking the lockable portion of the memory to allow a predetermined number o... | 09/28/1993 |
| 5193173 | Method and device for storing data subjected to dispersion processing A data storing device for storing data subjected to dispersion processing is disclosed, in which input data are subjected to a dispersion processing by a convolution operation of the input data with a dispersion function, and dispersed data thus obtained ... | 03/09/1993 |
| 5175842 | Data storage control system capable of reading data immediately after powered on A data control system includes an external memory unit for storing data, a volatile memory for storing at-least-once accessed data from the external memory unit, a nonvolatile memory for storing frequently-accessed pieces of data among the data stored in ... | 12/29/1992 |
| 5159692 | Image file system with multiple control image transfer between first and second filing system storage An electronic image filing system includes a reader for reading desired information from a first storage medium containing a plurality of information, a storing device for storing the image read by the reader into a second storage medium, and a controller... | 10/27/1992 |
| 5093909 | Single-chip microcomputer including an EPROM capable of accommodating different memory capacities by address boundary discrimination A single-chip microcomputer includes therein an electrically programmable read-only memory (EPROM) including a specific cell of the EPROM storing an item of information for discrimination of memory space. When a reset signal is applied for initializing th... | 03/03/1992 |
| 4644494 | Solid state memory for aircraft flight data recorder systems A memory unit for a aircraft flight data recorder system uses an electronically erasable solid state memory for storing the flight data and a memory controller circuit are housed in a penetration resistant, thermally insulated enclosure. Power dissipation... | 02/17/1987 |
| 4564922 | Postage meter with power-failure resistant memory A security system for a postage meter includes two memories, one of which is an electronically programmable READ-ONLY memory having non-volatile storage, while the second memory is a shadow RAM which is a composite memory having a first section composed o... | 01/14/1986 |
| 4506323 | Cache/disk file status indicator with data protection feature A data processing system has a host processor, a RAM, a cache memory for storing segments of data, a plurality of disk drive devices and a storage control unit for controlling data transfers, data from the host processor being written to the cache memory ... | 03/19/1985 |
| 4485456 | Data processor with R/W memory write inhibit signal A main power source voltage is compared with a reference voltage, when the main power voltage drops lower than the reference voltage, an operation/halt signal is formed, a read/write memory write inhibit signal is formed in response to the operation/halt ... | 11/27/1984 |
