Abstract: The storage device and storage virtualization system include a non-volatile memory device, and a memory controller configured to generate at least one virtual device corresponding to a physical storage area of the non-volatile memory device, and convert a virtual address for the virtual device into a physical address in response to an access request.

Abstract: A computing system includes a storage device in which file data is stored through data blocks and metadata is stored through a node block, and a file system configured to manage the file data and the metadata stored in the storage device. The node block includes data pointers respectively pointing to the data blocks, and one or more extents each indicative of data block groups which include data blocks having continuous physical addresses among the data blocks.

Abstract: A data management method of a computing system includes dividing a storage device into a first area and a second area, storing data and nodes related to the data in the second area, and storing a node address table in the first area. The node address table includes node identifiers corresponding to the nodes and physical addresses corresponding to the node identifiers.

Abstract: A method of managing data of a file system using a database management system is provided. According to the method, the metadata of the file system is managed using a database management system (DBMS), but writing data to or reading data from a disk is directly performed by the file system according to the method directly performed not through other file systems or DBMSs. In this way, stable transactions are guaranteed for a user, and the user can design a disk allocation algorithm optimized with respect to a multimedia environment.

Abstract: A method of performing data management in a computing system comprises performing a checkpointing operation comprising storing checkpoint of the computing system, writing a plurality of nodes in a plurality of node blocks in a sequential write method after the checkpointing operation, each of the plurality of nodes comprising position information of a next node block, and during a subsequent recovery operation, selecting a node for recovery by scanning of the plurality of node blocks using the position information.

Abstract: Victim segments to be returned to a free area in a segment cleaning process from a plurality of segments included in each segment group are selected by using a method corresponding to the segment group. A host comprises an interface relaying data exchange with a storage device; and a file system module performing a segment cleaning process by selecting victim segment from a plurality of segments stored in the storage device, discovering live blocks in each of the victim segments, writing back the discovered live blocks to the storage device through the interface, and returning the victim segments to a free area. The file system module calculates victim points for all segments included in a first segment group using a first victim point calculation formula, calculates victim points for all segments included in a second segment group using a second victim point calculation formula, and selects the victim segments based on the victim points.

Abstract: A method of operating a data storage device includes receiving a log start command from a controller, generating a log for write commands communicated from the controller in response to the log start command, storing the log in a memory, receiving a log read command from the controller, and communicating the log stored in the memory to the controller in response to the log read command.

Abstract: A method of managing a data storage device including a memory controller and a memory device includes: calculating a first sequential and consecutive write cost (SCWC) according to a garbage collection (GC) write operation policy, a second SCWC according to a slack space recycling (SSR) write operation policy and a third SCWC according to an in-place updating (IPU) write operation policy respectively, in response to a write request in the memory controller; determining a write operation policy which has a minimum cost of the first through third SCWCs; and writing data in a selected segment in the memory device according to the determined write operation policy.

Abstract: A computing system a storage device and a file system. The storage device includes a storage area having flash memory. The file system is configured to divide the storage area into multiple zones, multiple sections and multiple blocks, and to write a log in each block. The file system includes a block allocation module. The block allocation module is configured to allocate a target block, in which a log is to be written, by a continuous block allocation method according to which a block having a continuous address with a most recently selected block is set as the target block. The block allocation module is further configured to find a free section from the multiple sections when it is not possible to allocate the target block by the continuous block allocation method, and to set a block in the found free section as the target block.

Abstract: A method of managing data in a system including a nonvolatile memory includes storing a root object of application data, and at least one sub object referenced by the root object in the nonvolatile memory, and mapping virtual addresses of the root object and sub object to physical addresses of the nonvolatile memory respectively, in a page unit. The root object stored in the nonvolatile memory includes a pointer that references the sub object stored in the nonvolatile memory.

Abstract: A task scheduling method of a semiconductor device, the method including: determining whether a power level of a first queue task disposed in a first queue and a power level of a first core task are the same as each other, wherein the first queue task is to be processed by a first core after the first core task; and in response to the power level of the first queue task and the power level of the first core task being different, moving the first queue task to a second queue, wherein the second queue corresponds to a second core that processes a second core task having the same power level as that of the first queue task.

Abstract: A device includes a memory controller, a memory bus coupled to the memory controller, an internal memory and an external memory connection unit. The internal memory may be directly connected to the memory controller through the memory bus. The external memory connection unit may connect an external memory directly to the memory controller through a portion of signal lines in the memory bus, and may generate a flag signal indicating whether the external memory is connected to the external memory connection unit.

Abstract: A host configured to interact with a storage device includes a write-back (WB) cache configured to write data to the storage device, a cache managing module configured to manage the WB cache, and a file system module configured to determine whether live blocks in victim segments among a plurality of segments stored in the storage device are stored in the WB cache, to read the live blocks from the storage device as a consequence of determining that the live blocks are not stored in the WB cache, to load the read live blocks to the WB cache, and to request the cache managing module to set dirty flags for the stored live blocks.

Abstract: A swapping method performed using a data processing device, which includes a processor including a plurality of cores, the swapping method including searching for an empty page of a swap memory in response to the swap memory being connected to the data processing device, the search being performed by using at least one core of the plurality of cores, selecting a page to be swapped from a main memory of the data processing device, the selection being performed by using the at least one core by accessing a corresponding main memory list among a plurality of main memory lists, and swapping data of the page selected to be swapped to the empty page, the swapping being performed by using the at least one core.

Abstract: Provided are an apparatus and method for adapting an input/output interface. According to the exemplary method, a host system adapts an input/output interface of the guestsystem a to an input/output unit capability of a host system so as to support a service supported by an input/output unit supporting the input/output unit capability of the guest system using the at least one input/output unit of the host system.

Abstract: Provided is a method of controlling memory access. In a system including a first layer element executed in a privileged mode having a first priority of permission to access the entire region of a memory and second and third layer elements executed in an unprivileged mode having a second priority of permission to access a partial region of the memory, the method of controlling memory access determines whether the memory is accessible for each page that is an address space unit, based on which mode a layer element currently accessing the memory is executed in between the privileged mode and the unprivileged mode; and determines whether the memory is accessible based on which one of the first, second and third layer elements corresponds to a domain currently being attempted to be accessed from among a plurality of domains of the memory.

Abstract: A hybrid memory system includes a central processing unit, a storage device configured to store user data and code data, and a main memory including a volatile memory and a nonvolatile memory, the main memory being configured to receive data necessary to perform an operation of the central processing unit from the storage device and to store the data, a part of the volatile memory being allocated for a cache for data stored in the nonvolatile memory.

Abstract: A memory device may include a normal cell which is configured to be programmed to a first resistance and stabilized as a resistance of the normal cell drifts from the first resistance to a second resistance; a flag cell which is configured to be programmed to a third resistance smaller than the first resistance and stabilized as a resistance of the flag cell drifts from the third resistance to a fourth resistance smaller than the second resistance; and a decision circuit which is configured to decide whether the flag cell has been stabilized in order to determine whether the normal cell has been stabilized.

Abstract: A program installation apparatus may install a program in an immediately executable form using a snapshot image. The snapshot image may store a partially executed result of the program. A snapshot point at which the snapshot image is created may be decided by analyzing dependency on a system execution environment of the program. The program installation apparatus may, in advance, execute a part of the program having no dependency on the system execution environment to create a snapshot image and then execute the remaining part of the program based on the snapshot image, reducing a start-up time of the program.

Abstract: A memory device includes a hash table storing a hash value, a bit value, and a page address for each of a plurality of pages, a memory cell unit configured to store the pages and output contents corresponding to the page addresses of the pages having a same hash value, and a controller including a comparator configured to compare the contents output from the memory cell unit and change at least one bit value associated with a respective one of the pages upon determining that the contents of the pages are the same.