It is accurate to calculate the zone quantity of hard disk

Formula: ( n-1) *4+1024*n
10 G=( 10-1) *4+1024*10=10276MB
15 G=( 15-1) *4+1024*15=15416MB
20 G=( 20-1) *4+1024*20=20556MB
25 G=( 25-1) *4+1024*25=25696MB
30 G=( 30-1) *4+1024*30=30836MB
35 G=( 35-1) *4+1024*35=35986MB
40 G=( 40-1) *4+1024*40=41116MB
45 G=( 45-1) *4+1024*45=46256MB
50 G=( 50-1) *4+1024*50=51396MB

Pour: N expresses