System and method of writing to nonvolatile memory using write buffers

A memory system connectable to a host, the host including a write buffer, the memory system comprising:

• a nonvolatile memory including a block, the block being a unit of a data erase operation, the block including a plurality of word lines, each of the plurality of word lines connecting a plurality of memory cells;
• and
• a controller electrically connected to the nonvolatile memory and configured to:
• acquire first write data from the write buffer;
• write the first write data to a first memory cell connected to a first word line in the block;
• and
• in response to detecting that a first command is not received from the host for a threshold time period, the first command being to instruct to write second write data to a second memory cell connected to a second word line in the block, the second word line being different from the first word line, write dummy data to the second memory cell, wherein
• the controller is further configured to:
• keep the first write data in a region of the write buffer, without releasing the region, after the first write data is written to the first memory cell until the dummy data is written to the second memory cell;
• and
• upon the dummy data being written to the second memory cell, release the region of the write buffer.