A volatile memory and a method for efficient bulk data movement, backup operation in the volatile memory device are provided. The volatile memory device includes: a plurality of subarray, configured to access data, wherein each of the subarray is electrically coupled to each other. The row address control, configured to control the row of each of the plurality of subarray. The column control, configured to control the column of each of the plurality of subarray. The plurality of sense amplifier, adapted to each of the plurality of sub array is periodically enabled during the data access operation. The plurality of sub word driver, adapted on the adjacent to the plurality of sub array provides a driving signal to the corresponding word line in the plurality of subarray. The volatile memory device performs a data movement operation in a predetermined block and determine an odd data and an even data in the predetermined block. The volatile memory device enables a first backup block and a second backup block in a dynamic memory array through the row address control and backup the odd data and the even data simultaneously into the first backup block and the second backup block.