There are two types of commands in CDVD. (Normal) N and (Special) S. Both will be listed here:

Special Commands

Value	Command
0x01	CD_SCMD_READCLOCK
0x02	CD_SCMD_WRITECLOCK
0x03	CD_SCMD_GETDISKTYPE
0x04	CD_SCMD_GETERROR
0x05	CD_SCMD_TRAYREQ
0x06	CD_SCMD_READ_ILINK_ID
0x07	CD_SCMD_WRITE_ILINK_ID
0x08	CD_SCMD_READ_NVM
0x09	CD_SCMD_WRITE_NVM
0xA	CD_SCMD_DEC_SET
0xB	CD_SCMD_SCMD
0xC	CD_SCMD_STATUS
0xD	CD_SCMD_SET_HD_MODE
0xE	CD_SCMD_OPEN_CONFIG
0xF	CD_SCMD_CLOSE_CONFIG
0x10	CD_SCMD_READ_CONFIG
0x11	CD_SCMD_WRITE_CONFIG
0x12	CD_SCMD_READ_CONSOLE_ID
0x13	CD_SCMD_WRITE_CONSOLE_ID
0x14	CD_SCMD_READ_MECHACON_VERSION
0x15	CD_SCMD_CTRL_AD_OUT
0x16	CD_SCMD_BREAK
0x17	CD_SCMD_READ_SUBQ
0x18	CD_SCMD_FORBID_DVDP
0x19	CD_SCMD_AUTO_ADJUST_CTRL
0x1A	CD_SCMD_READ_MODEL_NAME
0x1B	CD_SCMD_WRITE_MODEL_NAME
0x1C	CD_SCMD_FORBID_READ
0x1D	CD_SCMD_SPIN_CTRL
0x1E	CD_SCMD_BOOT_CERTIFY
0x1F	CD_SCMD_CANCELPOWEROFF
0x20	CD_SCMD_BLUELEDCTRL
0x21	CD_SCMD_POWEROFF
0x22	CD_SCMD_MMODE
0x23	CD_SCMD_SETTHREADPRI

Normal Commands