FDC_500KBPS       123 arch/i386/include/ioctl_fd.h #define	FDC_500KBPS	0x00	/* 500KBPS MFM drive transfer rate */
FDC_500KBPS        54 dev/isa/fdreg.h #define	FDC_500KBPS	0x00	/* 500KBPS MFM drive transfer rate */