Memory controller operating method for read operations in system having nonvolatile memory device

A system comprising:

• a nonvolatile memory device;
• and
• a memory controller configured to control execution of a read operation directed to read data stored in the nonvolatile memory device, wherein the read data includes a plurality of data units, each of the plurality of data units is identified as one of a correctable data unit and an uncorrectable data unit, the data of the uncorrectable data unit being uncorrectable using a normal error correction operation,
• the memory controller being further configured to perform the normal error correction operation on the at least one correctable data unit of the plurality of data units to generate partial read data, communicate dummy data instead of the at least one uncorrectable data unit along with the partial read data to the host, and perform an enhanced error correction operation on the at least one uncorrectable data unit while at least in part the dummy data and partial data are being communicated from the memory controller to the host.

An operating method for a memory controller, comprising:

• receiving a first command from host identifying a first read operation directed to first read data stored in a nonvolatile memory device, the first read data including a correctable data unit and an uncorrectable data unit, wherein the uncorrectable data unit contains data that is uncorrectable using a normal error correction operation;
• receiving a second command from the host identifying a second read operation directed to second read data stored in the nonvolatile memory device;
• performing the normal error correction operation on the correctable data unit of the first read data to generate partial read data;
• communicating dummy data instead of the uncorrectable data unit along with the partial read data from the memory controller to a host;
• and
• performing an enhanced error correction operation on the uncorrectable data unit while at least in part executing the second read operation.