SK
#define CMD_READ (MT + SK + FDRAW_RDCMD + MFM)
csb->csb_cmds[0] = SK | FDRAW_RDCMD | MFM;
csb->csb_cmds[0] = MT | SK | FDRAW_RDCMD | MFM;
csb->csb_cmds[0] = SK + FDRAW_RDCMD;
csb->csb_cmds[0] = MT + SK + FDRAW_RDCMD;