bsbpb
struct bsbpb *bsbpb;
bsbpb = (struct bsbpb *)(img + x1);
mk2(bsbpb->bpbBytesPerSec, bpb.bpbBytesPerSec);
mk1(bsbpb->bpbSecPerClust, bpb.bpbSecPerClust);
mk2(bsbpb->bpbResSectors, bpb.bpbResSectors);
mk1(bsbpb->bpbFATs, bpb.bpbFATs);
mk2(bsbpb->bpbRootDirEnts, bpb.bpbRootDirEnts);
mk2(bsbpb->bpbSectors, bpb.bpbSectors);
mk1(bsbpb->bpbMedia, bpb.bpbMedia);
mk2(bsbpb->bpbFATsecs, bpb.bpbFATsecs);
mk2(bsbpb->bpbSecPerTrack, bpb.bpbSecPerTrack);
mk2(bsbpb->bpbHeads, bpb.bpbHeads);
mk4(bsbpb->bpbHiddenSecs, bpb.bpbHiddenSecs);
mk4(bsbpb->bpbHugeSectors, bpb.bpbHugeSectors);
x1 += sizeof(struct bsbpb);