cdrecord errors messages

[Aiza]

Just started using cdrecord command.

cdrecord dev=1,0,0 speed=4 blank=fast
cdrecord dev=1,0,0 speed=4 -data cd.iso

Both of the above commands generate these messages

acd0: FAILURE - unknown CMD (0x03) ILLEGAL REQUEST asc=0x20 ascq=0x00
acd0: FAILURE - unknown CMD (0x03) ILLEGAL REQUEST asc=0x20 ascq=0x00
acd0: FAILURE - MODE_SENSE_BIG ILLEGAL REQUEST asc=0x24 ascq=0x00 
sks=0x4d 0x00
acd0: FAILURE - MODE_SENSE_BIG ILLEGAL REQUEST asc=0x24 ascq=0x00 
sks=0x4d 0x00
acd0: FAILURE - MODE_SELECT_BIG ILLEGAL REQUEST asc=0x26 ascq=0x00 
sks=0x0b 0x00
acd0: FAILURE - MODE_SELECT_BIG ILLEGAL REQUEST asc=0x26 ascq=0x00 
sks=0x0b 0x00

Why is this and what can i do to correct this?
The CD seems to be written ok.