摘要:
Host system data files are written directly to a large erase block flash memory system with a unique identification of each file and offsets of data within the file but without the use of any intermediate logical addresses or a virtual address space for the memory. Directory information of where the files are stored in the memory is maintained within the memory system by its controller, rather than by the host.
摘要:
Data files are assigned addresses within one or more logical blocks of a continuous logical address space interface (LBA interface) of a usual type of flash memory system with physical memory cell blocks. This assignment may be done by the host device which typically, but not necessarily, generates the data files. The number of logical blocks containing data of any one file is controlled in a manner that reduces the amount of fragmentation of file data within the physical memory blocks, thereby to maintain good memory performance. The host may configure the logical blocks of the address space in response to learning the physical characteristics of a memory to which it is connected.
摘要:
A method and system for interfacing a system operating through a logical address space with a direct file storage (DFS) medium is disclosed. The method includes receiving data associated with addresses in a logical block address (LBA) format from a host system and generating file objects manageable by the DFS medium based on a determination of the correlation of the LBA data to host file data. The memory system includes non-volatile memory using the DFS format, an interface for receiving LBA format data, and a controller configured to communicate with the host via an LBA interface and generate file objects from the LBA format data correlated to the host application files usable by the memory system.
摘要:
Host system data files are written directly to a large erase block flash memory system with a unique identification of each file and offsets of data within the file but without the use of any intermediate logical addresses or a virtual address space for the memory. Directory information of where the files are stored in the memory is maintained within the memory system by its controller, rather than by the host. The file based interface between the host and memory systems allows the memory system controller to utilize the data storage blocks within the memory with increased efficiency.
摘要:
Data files are assigned addresses within one or more logical blocks of a continuous logical address space interface (LBA interface) of a usual type of flash memory system with physical memory cell blocks. This assignment may be done by the host device which typically, but not necessarily, generates the data files. The number of logical blocks containing data of any one file is controlled in a manner that reduces the amount of fragmentation of file data within the physical memory blocks, thereby to maintain good memory performance. The host may configure the logical blocks of the address space in response to learning the physical characteristics of a memory to which it is connected.
摘要:
A method and system writes data to a memory device including dynamic assignment of logical block addresses (LBAs) to physical write blocks. The method includes receiving a request to write data for a logical block address within an LBA range to the memory device. The method assigns the LBA range to a particular write block exclusively or non-exclusively, depending on the existence of previously assigned write blocks and the availability of unwritten blocks. A data structure may be utilized to record the recent usage of blocks for assigning non-exclusive write blocks. An intermediate storage area may be included that implements the dynamic assignment of LBA ranges to physical write blocks. Data in the intermediate storage area may be consolidated and written to the main storage area. Lower fragmentation and write amplification ratios may result by using this method and system.
摘要:
A method and system for reading data from a non-volatile mass storage device is provided. The method includes, performing logical configuration for the non-volatile mass storage device, wherein file data is allocated addresses in a virtual logical address space; and data identified by virtual logical addresses is read by a host system. The system includes a file storage segment that reads and writes data on a file-by-file basis, allowing a host system to access data from the non-volatile mass storage device using a file interface format; and a logical interface segment that allows the host system to access data using logical addressing, wherein the host system is unaware of a storage format under which data is stored on a file-by-file basis.
摘要:
Host system data files are written directly to a large erase block flash memory system with a unique identification of each file and offsets of data within the file but without the use of any intermediate logical addresses or a virtual address space for the memory. Directory information of where the files are stored in the memory is maintained within the memory system by its controller, rather than by the host. A type of memory block is selected to receive additional data of a file that depends upon the types of blocks into which data of the file have already been written. Blocks containing data are selected for reclaiming any unused capacity therefrom by a process that selects blocks in order starting with those containing the least amount of valid data.
摘要:
A change in the amount of data to be stored that results from various encoding, compression, encryption or other data transformation algorithms, is handled by individually identifying distinct units of the transformed data and storing such units in physical succession within storage blocks of a memory system such as flash memory. The data being stored may come from a host system external to the memory system or from an application running on a processor within the memory system.
摘要:
A method and system for storage address re-mapping is disclosed. The method includes allocating logical addresses in blocks of clusters and re-mapping logical addresses into storage address space, where short runs of data dispersed in logical address space are mapped in a contiguous manner into blocks in storage address space. Valid data is flushed from blocks having both valid and obsolete data to make new blocks available for receiving data when an available number of new blocks falls below a desired threshold. The system includes a host file system, processor executable instructions residing on a host separately from the host file system or residing on a flash memory device such as an embedded solid state disk, or a backend memory manager of the flash memory device that is configured to map data from a logical address space to complete blocks in storage address space in a contiguous manner.