Storage controller and storage device including thereof

A storage controller configured to control a nonvolatile memory device comprising a first namespace and a second namespace, the storage controller comprising:

• a map data memory device comprising:
• a first dedicated caching area storing a first plurality of address mapping tables for the first namespace;
• and
• a second dedicated caching area storing a second plurality of address mapping tables for the second namespace;
• and
• a caching manager configured to manage a capacity of each of the first dedicated caching area and the second dedicated caching area.

A storage device configured to communicate with a first host and a second host, the storage device comprising:

• a nonvolatile memory device configured to store a global address mapping table comprising a first plurality of address mapping tables and a second plurality of address mapping tables respectively corresponding to the first host and the second host;
• and
• a storage controller comprising:
• a map data memory device configured to cache at least one of the first plurality of address mapping tables or the second plurality of address mapping tables;
• and
• a caching manager configured to manage a first occupation guarantee ratio of the first plurality of address mapping tables for the map data memory device.