Memory device, memory system including the memory device, and operating method of the memory system

A memory device, a memory system including the memory device, and an operating method of the memory system are provided. The memory device includes: a memory block including a plurality of main pagesand a dummy page; a peripheral circuit for performing a normal program operation on the plurality of main pages and a dummy program operation on the dummy page in a program operation, and reading datastored in the dummy page and the plurality of main pages in a read operation; and control logic for controlling the peripheral circuit to program, to the dummy page, the same data as first logical page data of a first main page among the plurality of main pages in the program operation. 存储器装置、包括其的存储器系统及存储器系统操作方法。存储器装置包括：存储器块，该存储器块包括虚设页和多个主页；外围电路，该外围电路用于在编程操作中对多个主页执行正常编程操作并且对虚设页执行虚设编程操作，并且在读取操作中读取虚设页和多个主页中存储的数据；以及控制逻辑，该控制逻辑用于控制外围电路以在编程操作中将与多个主页当中的第一主页的第一逻辑页数据相同的数据编程到虚设页。