Abstract: A memory system includes memory blocks and a controller. The controller configured to perform a wear levelling operation on the memory blocks based on a reference count table and an erase count table.

Abstract: A controller controls an operation of a semiconductor memory device. The controller includes a request analyzer, a storage, and a garbage collection controller. The request analyzer generates invalid data information, based on an erase request received from a host. The storage stores a garbage collection reference table representing memory blocks excluded from selection as a victim block on which a garbage collection operation is to be performed, based on the invalid data information. The garbage collection controller controls the garbage collection operation on the semiconductor memory device, based on exclusion block information generated according to the garbage collection reference table.

Abstract: A storage device includes a nonvolatile memory including a plurality of first blocks having memory cells each configured to store one bit of data and a plurality of second blocks having memory cells each configured to multiple bits of data; and a controller configured to determine whether or not a number of use-completed second blocks, each of which has a first threshold number or less of valid pages, among use-completed second blocks of the plurality of second blocks, is equal to or larger than a second threshold number and to select, according to a determination result, a victim block on which garbage collection is to be performed among used-completed first blocks of the plurality of first blocks or the use-completed second blocks each having the first threshold number or less of valid pages.

Abstract: A storage device includes a nonvolatile memory including a plurality of first blocks having memory cells each configured to store one bit of data and a plurality of second blocks having memory cells each configured to multiple bits of data; and a controller configured to determine whether or not a number of use-completed second blocks, each of which has a first threshold number or less of valid pages, among use-completed second blocks of the plurality of second blocks, is equal to or larger than a second threshold number and to select, according to a determination result, a victim block on which garbage collection is to be performed among used-completed first blocks of the plurality of first blocks or the use-completed second blocks each having the first threshold number or less of valid pages.

Abstract: A controller controls an operation of a semiconductor memory device. The controller includes a request analyzer, a storage, and a garbage collection controller. The request analyzer generates invalid data information, based on an erase request received from a host. The storage stores a garbage collection reference table representing memory blocks excluded from selection as a victim block on which a garbage collection operation is to be performed, based on the invalid data information. The garbage collection controller controls the garbage collection operation on the semiconductor memory device, based on exclusion block information generated according to the garbage collection reference table.

Abstract: A controller controls an operation of a semiconductor memory device. The controller includes a request analyzer, a storage, and a garbage collection controller. The request analyzer generates invalid data information, based on an erase request received from a host. The storage stores a garbage collection reference table representing memory blocks excluded from selection as a victim block on which a garbage collection operation is to be performed, based on the invalid data information. The garbage collection controller controls the garbage collection operation on the semiconductor memory device, based on exclusion block information generated according to the garbage collection reference table.

Abstract: A controller controls an operation of a semiconductor memory device. The controller includes a request analyzer, a storage, and a garbage collection controller. The request analyzer generates invalid data information, based on an erase request received from a host. The storage stores a garbage collection reference table representing memory blocks excluded from selection as a victim block on which a garbage collection operation is to be performed, based on the invalid data information. The garbage collection controller controls the garbage collection operation on the semiconductor memory device, based on exclusion block information generated according to the garbage collection reference table.