Memory system and control method

A memory system connectable to a host, comprising:

• a nonvolatile memory including physical blocks, each of the physical blocks is a unit of a data erasure operation;
• and
• a controller electrically connected to the nonvolatile memory and configured to write data to the nonvolatile memory and execute a read-and-verify operation to determine whether the data is to be read from the nonvolatile memory normally,
• wherein
• each of the physical blocks includes physical pages, each of the physical pages is a unit of a data write operation and a data read operation;
• and
• the controller is configured to:
• manage logical blocks each including two or more physical blocks, each of the logical blocks including logical pages each including two or more physical pages;
• execute a data write operation in units of logical pages in a write destination logical block;
• upon receiving a first write command from the host, start to receive first data associated with the first write command;
• select a first logical page from the logical pages, to which seventh data has already been written and for which no read-and-verify operation has been executed;
• execute a read-and-verify operation for the first logical page;
• and
• write the first data to a second logical page in a write destination logical block of the logical blocks.

A control method for controlling a memory system connectable to a host, the method comprising:

• upon receiving a write command from the host,
• receiving first data associated with the write command received from the host;
• selecting a first page from pages of physical pages in a nonvolatile memory of the memory system, to which second data has already been written and for which no read-and-verify operation has been executed;
• executing a read-and-verify operation for the selected first page;
• and
• writing the received first data to a second page in a write destination block among the physical blocks in the nonvolatile memory.