WDCS_DSC
if (buf[p] & WDCS_DSC)
!(chp->ch_status & (WDCS_DSC | WDCS_DRQ))) {
#define BAD_BIT_COMBO (WDCS_DRDY | WDCS_DSC | WDCS_DRQ | WDCS_ERR)
(WDCS_DRDY | WDCS_DSC | WDCS_DRQ),
(WDCS_DRDY | WDCS_DSC), 1000);
if ((chp->ch_status & 0xfc) != (WDCS_DRDY | WDCS_DSC)) {