NON-VOLATILE MEMORY DEVICE AND STORAGE DEVICE

A storage device includes at least one non-volatile memory including a plurality of blocks, each block of the plurality of blocks including a plurality of independently erasable sub-blocks. The storage device further includes a storage controller configured to select an erase mode from among a plurality of erase modes according to at least one of an operation schedule and a power consumption of the non-volatile memory, and control an erase operation of the non-volatile memory, according to the selected erase mode. Based on the selected erase mode being a first sub-block erase mode, the storage controller controls an erase operation with respect to one selected sub-block of a selected block. Based on the selected erase mode being a second sub-block erase mode, the storage controller controls an erase operation with respect to two or more selected sub-blocks of the selected block.