Problem in SCSI CD writer recognition RH7.1

[Alainovitch]

Hi !
I have installed a CD Writer Yamaha CRW3200S on my machine (RedHat 7.1).
the cat /proc/scsi/scsi give me :
>Attached devices:
>Host: scsi0 Channel: 00 Id: 01 Lun: 00
> Vendor: YAMAHA Model: CRW3200S Rev: 1.0d
> Type: CD-ROM ANSI SCSI >revision: 02

So everything seems to work well but cdrecord dosn't not work and cdrecord -scanbus either. It gives me (as root user):

>cdrecord: No such file or directory. Cannot open SCSI driver.
>cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.

What's wrong ???
My scsci card seems to work well, i have a tape drive which works fine. The Cd writer is properly mounted on /dev/cdrom1 which is a link to /dev/scd0 and i can read what i have on disks.
But the command cdrecord -v dev=0,1,0 -atip gives me :
> TOC Type: 1 = CD-ROM
> scsidev: '0,1,0'
> scsibus: 0 target: 1 lun: 0
> cdrecord: No such device. Cannot open '/dev/pg1'. Cannot open SCSI driver.
> cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.

Why is he trying to open /dev/pg1 ??
Thanks in advance for your answer

Al