Storage device and operating method thereof

A method for operating a memory controller that controls a memory device including a plurality of memory areas respectively corresponding to a plurality of groups of logical addresses to be provided by a host and a buffer memory including a common buffer and a plurality of zone buffers respectively corresponding to the plurality of memory areas, the method comprising:

• receiving, from the host, a logical address and write data corresponding to the logical address;
• determining whether a size of the write data exceeds an available storage capacity of a zone buffer, corresponding to the logical address, among the plurality of zone buffers, the available storage capacity representing a size of an empty storage space of the zone buffer in which no data is stored;
• controlling the buffer memory to store the write data in the zone buffer in response to that the size of the write data is equal to or smaller than the available storage capacity of the zone buffer;
• and
• controlling the buffer memory to store the write data in the common buffer in response to that the size of the write data exceeds the available storage capacity of the zone buffer.

A storage device comprising:

• a memory device including a plurality of memory areas respectively corresponding to a plurality of logical address groups, each of which corresponds to consecutive logical addresses provided by a host;
• a plurality of zone buffers respectively corresponding to the plurality of memory areas, the plurality of zone buffers respectively storing data corresponding to the plurality of logical address groups;
• and
• a memory controller configured to control the plurality of zone buffers to store write data corresponding to a logical address provided by the host in a zone buffer corresponding to the logical address among the plurality of zone buffers.