Memory system and method of controlling the memory system

A memory system connectable to a host, comprising:

• a nonvolatile memory including a plurality of storage locations respectively designated by a plurality of physical addresses, the plurality of storage locations including at least a first storage location designated by a first physical address;
• and
• a controller electrically connected to the nonvolatile memory and configured to:
• manage mapping information using a first management table, the mapping information indicating a mapping between each of a plurality of logical addresses used by the host to access the memory system and each of the plurality of physical addresses, the plurality of logical addresses including at least a first logical address;
• manage a plurality of flags using a second management table, the plurality of flags being respectively associated with the plurality of physical addresses, the plurality of flags including at least a first flag associated with the first physical address, each of the plurality of flags being configured to include either (A) a first value indicating that data stored in one of the plurality of storage locations designated by one of the plurality of physical addresses associated therewith is valid, or (B) a second value indicating that data stored in one of the plurality of storage locations designated by one of the plurality of physical addresses associated therewith is invalid;
• in response to receiving a write command specifying the first logical address from the host:
• map, in the first management table, the first physical address to the first logical address,
• write first data associated with the write command to the first storage location, and
• set, in the second management table, the first flag to have the first value;
• and
• in response to receiving a read command specifying the first logical address from the host:
• acquire, from the first management table, one of the plurality of physical addresses that is being mapped to the first logical address,
• read data from the nonvolatile memory based on the acquired physical address,
• acquire, from the second management table, one of the plurality of flags associated with the acquired physical address, and
• determine whether or not to transmit the read data to the host, based on whether the acquired flag has the first value or the second value.

A memory system connectable to a host, comprising:

• a nonvolatile memory including a plurality of storage locations respectively designated by a plurality of physical addresses, the plurality of storage locations including at least a first storage location designated by a first physical address;
• and
• a controller electrically connected to the nonvolatile memory configured to:
• manage mapping information using a first management table, the mapping information indicating a mapping between each of a plurality of logical addresses used by the host to access the memory system and each of the plurality of physical addresses, the plurality of logical addresses including at least a first logical address;
• in response to receiving a write command specifying the first logical address from the host:
• map, in the first management table, the first physical address to the first logical address,
• generate a first check code at least based on at least a part of the first physical address, and
• write first data associated with the write command and the first check code to the first storage location;
• and
• in response to receiving a read command specifying the first logical address from the host:
• acquire, from the first management table, one of the plurality of physical addresses that is being mapped to the first logical address,
• generate a second check code at least based on at least a part of the acquired physical address,
• read data and a third check code from the nonvolatile memory, based on the acquired physical address, and
• determine whether or not to transmit the read data to the host, based on whether the second check code matches the third check code.