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Abstract

In general, according to one embodiment, a memory system includes: a nonvolatile memory including a plurality of memory cells; and a memory controller having a first state in which write data transferred from an external host is written in the nonvolatile memory at a rate of a first number of bits per memory cell, and a second state in which the write data is written at a rate of a second number of bits per memory cell. The second number of bits differs from the first number of bits. The memory controller is configured to transmit information relating to a transfer rate of the write data to the host in response to a first request from the host. The information includes: first information associated with the first state; and second information associated with the second state.

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First Claim