FL_PERPND
#define FDF_3_2880 36,2,0xFF,0x1B,80,0,FDC_1MBPS,002,0x4C,1,1,FL_MFM|FL_PERPND
if (ft.flags & FL_PERPND) {
out->flags |= FL_PERPND;
out->flags &= ~FL_PERPND;
if (in.flags & FL_PERPND)