Disclosed are apparatuses and methods for writing data to a memory array of a buffer. One such apparatus may include a multiplexer that receives data words and a data mask. The multiplexer may change the order of the data words to group masked data words together and to group unmasked data words together. The multiplexer may also change the order of the data mask to group masking bits together and to group unmasking bits together. The apparatus may use the data words with the changed order and the data mask with the changed order to write data to the memory array.