a memory device including a plurality of dump blocks each storing data in non-volatile state; and

a controller suitable for:

generating dump data indicating a state thereof whenever detecting an error, and

storing the dump data in a target dump block,

wherein the controller stores the dump data by:

selecting the target dump block from the plurality of dump blocks,

storing first dump data which is generated at a time of initial error detection in a first dump block that is selected as the target dump block,

storing subsequent dump data, which is generated at a time of error detection of the same cause of the initial error after the first dump data is generated, in the first dump block, and

copying, when newly selecting a second dump block as the target dump block, only the first dump data excluding the subsequent dump data from the first dump block to the second dump block.