capacity = cpd * hpc * tph * spt * bps
= cpd * hpc * spt * 512
capacity : harddisk capacity in bytes cpd : cylinders per disk hpc : heads per cylinder tph : tracks per head (= 1) spt : sectors per track bps : bytes per sector (= 512)
If a harddisk has 16,384 cylinders per disk, 80 heads per cylinders, and 63 sectors per track, it has the capacity:
16,384 * 80 * 63 * 512 = 42,278,584,320 bytes = 39 GB