Problem with Tekram controller

Hi all, I have Tekram 315 SCSI controller and SCSI CDRW Teac 512SB cdrwtool works fine. I can format the CD with udf file system. When i try to write small file to cd and after that "umount and mount" again i have got the following message: mount: wrong fs type, bad option, bad superblock on /dev/cdrecorder, or too many mounted file systems Why i can not to see my CD? Thanks Kirill