A novel maize variety designated PH1MJ8 and seed, plants and plant parts thereof. The capacitive device includes a first electrode and a second electrode below the first electrode and spaced apart from the first electrode, wherein at least one of the first electrode and the second electrode includes a plurality of conductive step sections, the plurality of conductive step sections having different heights. Thus, it is possible to realize the picking-up operation with high productivity without causing a problem such as breakage or crack. Through such protection, the likelihood of damage to the disk drive or loss of data stored on the disk drive is able to be substantially reduced. A device for implementing such a method is also described.