System including data storage device and method of controlling discard operation in the same

A method of controlling discard operations in a system including a host device and a data storage device, the method comprising:

• providing a shared discard bitmap accessed commonly by the host device and the data storage device, the shared discard bitmap including discard bits in one-to-one correspondence with target sectors, among a plurality of sectors of a nonvolatile memory device in the data storage device;
• setting, by the host device, bit values of the discard bits stored in the shared discard bitmap, the bit values set to indicate whether data stored in each of the target sectors are discardable;
• performing, by the data storage device, an asynchronous discard operation with respect to the target sectors based on the bit values of the discard bits stored in the shared discard bitmap;
• and
• setting an address range of the shared discard bitmap based on a bitmap setting command provided from the host device to the data storage device, wherein the bitmap setting command includes a start address of the shared discard bitmap and a unit size of each target sector corresponding to each discard.

A method of controlling discard operations in a system including a host device and a data storage device, the method comprising:

• providing a shared discard bitmap accessed commonly by the host device and the data storage device, wherein the shared discard bitmap is stored in a random access memory device included in the data storage device, and wherein the shared discard bitmap includes discard bits in one-to-one correspondence with target sectors, among a plurality of sectors of a nonvolatile memory device in the data storage device;
• setting, by the host device, bit values of the discard bits stored in the shared discard bitmap, wherein the bit values are set to indicate whether data stored in each of the target sectors are discardable, and wherein the host device accesses the shared discard bitmap through a memory mapped input output interface between the host device and the data storage device;
• and
• performing, by the data storage device, an asynchronous discard operation with respect to the target sectors based on the bit values of the discard bits stored in the shared discard bitmap.