A magnetic disk control device according to an exemplary of the invention includes a write controller to control, in a magnetic disk having tracks, the track being a storage area made by concentrically dividing a magnetic recording layer formed onto a disk into a plurality of areas, the track being divided into a plurality of areas in a rotative direction as sectors, writing information into the each sector; and a substitution controller to make, by detecting the sector or the track written at a frequency higher than a writing frequency based on a number of times of writing by the write controller to the sector or the track and by moving information recorded in an adjacent track adjacent to a high-writing-frequency track including the detected high writing frequency sector or to a high-writing-frequency track which is detected as a high writing frequency track to a track of a substitution area.