Storage device including buffer and main memories, and user device including the same

A user device comprising:

• a host configured to provide a write request and successive blocks of write data;
• and
• a storage device configured to receive the write request and the successive blocks of write data from the host, and to store the successive blocks of write data at a buffer region or a main region of a flash memory, and
• wherein the storage device is configured to initially store blocks among the received successive blocks of write data in the main region of the flash memory, and to subsequently store remaining blocks among the received successive blocks of write data in the buffer region of the flash memory when a continuity count equals or exceeds a reference count,
• wherein the continuity count denotes a number of times a data size of the received successive blocks of write data consecutively equals or exceeds a reference data size.