[CentOS] ata errors from dmesg

dmesg is reporting

ata1: translated ATA stat/err 0x51/10 to SCSI SK/ASC/ASCQ 0xb/14/00
ata1: status=0x51 { DriveReady SeekComplete Error }
ata1: error=0x10 { SectorIdNotFound }

My HD disk is on /dev/sda1 so I presume this is errors from the CDROM.

Is there a command I can use to not do anything with the CDROM?
It was just there for install. This is an older machine running 4.4 i686 .
Its also remote so I just can't unplug the CDROM.

If there is a command to tell the kernel to ignore the CDROM that
would be great.

Thanks,

jerry