US Patent 9502128 Storage devices and methods of operating storage devices

A method of operating a storage device may include receiving a read command and a read address, performing a read operation on selected memory cells corresponding to a selected string selection line and a selected word line based on the read address and performing a reliability verification read on unselected memory cells. Data read by the read operation may be output to an external device, and data read by the reliability verification read may be not output to the external device.