An imaging system includes a radiation source configured to rotate around an examination region about a z-axis and having a focal spot that emits a radiation beam that traverses the examination region. At least some of the illustrative embodiments may be a computer system comprising a processor, and an external effects controller coupled to the processor. The rotation detection set comprises an encoder washer adapted to rotate around a rotation axis, at least two sensors adapted to detect the rotation of the encoder washer around the rotation axis and a support member. A position changing unit rotates the recording head around a shaft of the support member to move the recording head to first and second locations respectively facing the first and second sides of the recording medium. Subsequently, an application code is written to a remaining unused part of the primary sector.