fill_bpb_sizes
static void fill_bpb_sizes(bpb_t *wbpb, struct ipart part[],
fill_bpb_sizes(wbpb, part, bootPart, *seekto);
fill_bpb_sizes(wbpb, part, primaryPart, *seekto);
fill_bpb_sizes(wbpb, part, extndDrives[driveIndex],
fill_bpb_sizes(wbpb, part, extraDrives[driveIndex], *seekto);