Method of reading data about memory device, method of controlling memory controller, and storage device including memory device and memory controller

A method of operating a memory controller to control a memory device, the memory device including a plurality of physical memory pages connected to each of a plurality of word lines, the method comprising:

• controlling the memory device to perform a first read operation on a target logical memory page of a first physical memory page among the plurality of physical memory pages;
• receiving, from the memory device, a distribution determination result of a most significant program state of the target logical memory page;
• determining offset level compensation values based on the distribution determination result;
• updating offset level information based on the offset level compensation values to generate updated offset level information;
• and
• controlling the memory device to perform a second read operation on a second physical memory page among the plurality of physical memory pages based on the updated offset level information.

A storage device comprising:

• a memory device configured to determine, each time a read operation is performed on a target logical memory page included in a physical memory page, a threshold voltage distribution of a most significant program state of the target logical memory page for memory cells included in the physical memory page;
• and
• a memory controller configured to,
• receive a distribution determination result from the memory device,
• update offset level information based on the distribution determination result received from the memory device to generate updated offset level information, and
• control the read operation of the memory device based on the updated offset level information.