MEMORY SYSTEM AND CONTROL METHOD

A memory controller of a memory system includes a host interface, a memory interface, and a write buffer configured to temporarily store data of a second size that is greater than a first size of a sector in each of a plurality of entries. Each of the entries includes a plurality of sectors. The memory controller is configured to select one of the entries in which write data is to be stored, determine whether the selected entry is missing data of any sector, perform a host inquiry by transmitting a request for the missing data, store the missing data in the selected entry, and then perform a write operation to store the data of the selected entry into the nonvolatile memory at a continuous physical address range of the nonvolatile memory.