Method and apparatus for erasing data in flash memory

A data erasing apparatus applied to a flash memory, comprising:

• an interface;
• and
• at least one processor coupled to the interface;
• wherein the interface is configured to receive a data erasing instruction, wherein the data erasing instruction includes a logical block address corresponding to latest version data stored in a latest data section and historical version data stored in a historical data section, wherein the latest version data is obtained by modifying one of one or more historical version data including the historical data section;
• the at least one processor is configured to:
• search in a mapping table for a physical storage address of the latest data section based on the logical block address;
• search in a trace log for a physical storage address of the historical data section based on the logical block address;
• and
• erase all data in the latest data section identified by the physical storage address of the latest data section and in the historical data section identified by the physical storage address of the historical data section.

A data erasing method applied to a flash memory, comprising:

• receiving a data erasing instruction, wherein the data erasing instruction includes a logical block address and a data section identifier, the logical block address corresponds to latest version data stored in a latest data section and historical version data stored in a historical data section, the data section identifier is used to indicate one or more of the latest data section and the historical data section, wherein the latest version data is obtained by modifying one of one or more historical version data including the historical data section;
• searching in at least one of a mapping table and a trace log for a physical storage address of a data section corresponding to a section identifier based on the logical block address and the data section identifier, wherein the mapping table records a physical address of the latest data section, the trace log records a physical address of the historical data section;
• and
• erasing all data in the data section identified by the physical storage address of the data section.

A data erasing apparatus applied to a flash memory, comprising:

• an interface;
• and
• at least one processor coupled to the interface;
• wherein the interface is configured to receive a data erasing instruction, wherein the data erasing instruction includes a logical block address and a data section identifier, the logical block address corresponds to latest version data stored in a latest data section and historical version data stored in a historical data section, the data section identifier is used to indicate one or more of the latest data section and the historical data section, wherein the latest version data is obtained by modifying one of one or more historical version data including the historical data section;
• the at least one processor is configured to:
• search in at least one of a mapping table and a trace log for a physical storage address of a data section corresponding to a section identifier based on the logical block address and the data section identifier, wherein the mapping table records a physical address of the latest data section, the trace log records a physical address of the historical data section;
• and
• erase all data in the data section identified by the physical storage address of the data section.