In a servo pattern deviation correcting method and disk apparatus of the present invention, a read/write head writes information to a disk and reads information from the disk. Servo pattern blocks are written to respective sectors of the disk along a target track. A deviation of each servo pattern block from a position of the track in a transverse direction is detected. A deviation correction pattern for each servo pattern block is created based on the deviation of the servo pattern block. The deviation correction pattern is written to a predetermined region of the disk between each servo pattern block and a data region along the track. The deviation correction pattern is read from the predetermined region of the disk, so that the read/write head is shifted to a deviation-corrected position on the track based on the servo pattern block and the deviation correction pattern.