Data storage device and method of deleting namespace thereof

A method of deleting a namespace, for use in a data storage device, wherein the data storage device comprises a flash memory, the method comprising:

• managing a global logical-to-physical (L2P) mapping table of the flash memory, wherein the global L2P table comprises a plurality of namespaces, and the namespaces correspond to a plurality of physical spaces in the flash memory;
• receiving a namespace-deleting command from a host;
• deleting a target namespace from the plurality of namespaces and deleting a first logical-address range corresponding to the target namespace from the global L2P table;
• and
• moving a second logical-address range corresponding to each namespace subsequent to the target namespace in the global L2P mapping table to update the global L2P mapping table.

A data storage device, comprising:

• a flash memory;
• and
• a memory controller, configured to manage a global logical-to-physical (L2P) mapping table of the flash memory, wherein the global L2P table comprises a plurality of namespaces, and the namespaces correspond to a plurality of physical spaces in the flash memory,
• wherein in response to the memory controller receiving a namespace-deleting command from a host, the memory controller deletes a first target namespace from the namespaces and deletes a first logical-address range corresponding to the target namespace in the global L2P table,
• wherein in response to the memory controller receiving a namespace-creating command from the host to create a second target namespace, the memory controller further determines whether the second target namespace can be created in the first logical-address range corresponding to the first target namespace,
• wherein in response to the memory controller determining that the second target namespace cannot be created in the first logical-address range corresponding to the first target namespace, the memory controller moves a second logical-address range of each namespace subsequent to the first target namespace in the global L2P mapping table to update the global L2P mapping table, and creates the second target namespace in a remaining logical-address range in the updated global L2P mapping table.