Host and storage system for securely deleting files and operating method of the host

An operating method of a host, the method comprising:

• receiving a request to delete a first file included in a storage system through a secure deletion module supporting a secure deletion function;
• providing one of an unmap command and an overwrite command to the storage system in response to the request, for unmapping or overwriting data in the first file independently of an operating system installed in the host;
• providing an erase command to the storage system for erasing data invalidated according to the one of the unmap command and the overwrite command and erasing the data invalidated according to the one of the unmap command and the overwrite command by providing the erase command;
• and
• performing an operation by the operating system deleting the first file,
• wherein the erasing the data invalidated according to the one of the unmap command and the overwrite command by providing the erase command is performed before the operation by the operating system deleting the first file starts.

A storage system that communicates with a host, the storage system comprising:

• a memory device configured to store data and metadata of one or more files;
• and
• a controller configured to control a data access operation of the memory device,
• wherein the storage system includes a history table configured to store information associated with invalid data of the one or more files,
• wherein the controller is further configured to perform a first deletion operation on a first file in response to a first request from a secure deletion module in the host and a second deletion operation on the first file in response to a second request from an operating system in the host after the first deletion operation is completed, and
• wherein the first deletion operation includes invalidation of data of the first file in response to a command from the secure deletion module and erasure of the invalid data of the first file by referring to the history table in response to an erasure command of a first type from the secure deletion module.