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375 results about "Data erasure" patented technology

Data erasure (sometimes referred to as data clearing, data wiping, or data destruction) is a software-based method of overwriting the data that aims to completely destroy all electronic data residing on a hard disk drive or other digital media by using zeros and ones to overwrite data onto all sectors of the device. By overwriting the data on the storage device, the data is rendered unrecoverable and achieves data sanitization.

Erase block management

An improved Flash memory device with a distributed erase block management (EBM) scheme is detailed that enhances operation and helps minimize write fatigue of the floating gate memory cells of the Flash memory device. In the prior art, erase block management of a Flash memory device, which provides logical sector to physical sector mapping and provides a virtual rewriteable interface for the host, requires that erase block management data be kept in specialized EBM data tables to keep the state of the Flash memory device in case of loss of power. This placement of EBM data in a separate erase block location from the user data slows the Flash memory operation by requiring up to two writes and / or block erasures for every update of the user data. Additionally, one of the goals of the EBM control is to minimize write fatigue of the non-volatile floating gate memory cells of the Flash memory device erase blocks by re-mapping and distributing heavily rewritten user data sectors in a process called load leveling so that no one erase block gets overused too quickly and reduce the expected lifespan of the Flash memory device. The EBM data structures, however, are some of the most heavily rewritten non-volatile floating gate memory cells in the device and thus, while helping to reduce write fatigue in the Flash memory device, are some of the data structures most susceptible to the process of fatigue. The Flash memory device of the invention combines the EBM data in a user data erase block by placing it in an EBM data field of the control data section of the erase block sectors. Therefore distributing the EBM data within the Flash memory erase block structure. This allows the Flash memory to update and / or erase the user data and the EBM data in a single operation, to reduce overhead and speed operation. The Flash memory also reduces the process of EBM data structure write fatigue by allowing the EBM data fields to be load leveled by rotating them with the erase blocks they describe.
Owner:MICRON TECH INC

Data storage control method and apparatus for external storage device using a plurality of flash memories

The present invention is to realize a data storage control method and apparatus for an external storage device using flash memories. The method and apparatus can eliminate the data erasure waiting time, eliminating the calculation of the erasure numbers of flash memories, elongating the life-time of the flash memories. Data is stored sequentially from a first flash memory for rewrite data to a third flash memory for rewrite data. When there is no vacant area in the third flash memory for rewrite data, a CPU instructs a first flash memory for garbage collection among the first and second flash memories for garbage collection to perform the garbage collection of the first flash memory for rewrite data. When a host computer issues a write access request, the write process is performed in the first flash memory for garbage collection with the first priority. When the garbage collection of the first flash memory for rewrite data has been completed, the garbage collection of the second flash memory for rewrite data is performed by the second flash memory for garbage collection. At the time of performing the garbage collection of the second flash memory for rewrite data, the data of the first flash memory for rewrite data is simultaneously erased. The first flash memory for garbage collection is changed into a flash memory for rewrite data by the CPU. Upon completion of the garbage collection of the second flash memory for rewrite data, the data thereof is simultaneously erased and the second flash memory for garbage collection is changed into a flash memory for rewrite data. Then, the garbage collection of the third flash memory for rewrite data is performed in the similar manner.
Owner:HITACHI LTD

Rewritable optical information recording medium, recording and reproducing methods, as well as recording and reproducing apparatus

A rewritable optical information recording medium including a recording layer composed of an organic dye film is provided, in which recording and erasing information can be performed reversibly by laser light irradiation. A rewritable optical information recording medium including at least one organic dye film which is substantially made of only at least one kind of organic dye compounds as a recording film is provided. The recording and erasure of information are performed by a reversible physical change of the organic dye film substance caused by laser light irradiation. Specifically, data recording is performed by a physical change locally caused by the irradiation of recording laser light, data reproduction is performed by detecting change in intensity of returned light of reproducing laser light having less power than the recording laser light, and data erasure is performed by applying at least once continuous light or pulse light having laser power more than the reproducing laser light and less than the recording laser light. The physical change is a change in shape.
Owner:SONY CORP +1

System for remotely erasing data, method, server, and mobile device thereof, and computer program product

A system for remotely erasing data, a method, a server, and a mobile device thereof, and a computer program product are provided. The method is adapted for the mobile device having an internal storage unit and an external storage unit, wherein a user account of a service website is set up for the mobile device. In the method, a relationship between the user account and the mobile device is recorded in the server. The server receives a data erasing request corresponding to the user account through the service website, and sends a remote control command to the mobile device corresponding to the user account. Then, the mobile device erases data stored in the external storage unit thereof according to the remote control command.
Owner:HTC CORP

Offloading disk-related tasks from RAID adapter to distributed service processors in switched drive connection network enclosure

A storage system includes a RAID adapter, disk array switches, sub-processors, and hard disk drives (HDDs). A disk-related operation is initiated in the RAID adapter. The RAID adapter dispatches a command to a disk array processor (or sub-processor) in an enclosure for the processor to perform the operation on one or more drives. The adapter may dispatch the command to a processor in a single enclosure through a disk array switch or to processors in multiple enclosures through switches in the upstream enclosures. The adapter is then free to perform other functions. The processor commences the specified operation on one or more selected drives, either sequentially one at a time or sequentially more than one (or all) at a time. Upon completion of the operation, the results are transmitted by the processor and received by the adapter. Thus, by offloading the task to the distributed sub-processors, the burden on the RAID adapter is significantly reduced, system bandwidth usage is reduced, and access to other drives within the enclosure (as well as within other enclosures) may be maintained. Tasks which may be offloaded in such a manner include, but are not limited to, drive firmware updating, drive scrubbing and secure data erasure.
Owner:IBM CORP
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