Due to the imperfect mechanical precision of printers, it is not always your designed label is perfectly printed. The final printed label might not be in the exact center of the disc or cover all the whole disc area.

You can solve these problems by changing the center position of the label or the disc printable area. Remember that the errors are usually quite small so be careful when you change the center position of the label or the disc printable area. See: The Template Properties Panel

In Disketch, you can change these parameters at The Template Properties Panel of the Label Layout Editor dialog when you are designing your label or the Print Preview dialog when you are pre-printing for the final product.