MINBPS
if (bpb.bpbBytesPerSec < MINBPS ||
mk2(img + MINBPS - 2, DOSMAGIC);
mk4(img + MINBPS - 28, 0x61417272);
mk4(img + MINBPS - 24, 0xffffffff);
mk4(img + MINBPS - 20, 0xffffffff);
mk2(img + MINBPS - 2, DOSMAGIC);