[CentOS] Problems with SATA DVD+-RW drive

I just got a Dell Dimension e521 (AMD 64 x2, nVidia MCP51 chipset) and 
so far it has been fine.  Today I tried to burn some CD-R and DVD-R 
disks and have been able to do nothing but make coasters.  The drive is 
a TSST TS-H653a (Samsung OEM) and does have the current firmware. 
Playing back data, audio, and video disks work just fine, but recording 
is a different matter.

The drive shows up as /dev/scd0 and all the symlinks for /dev/cdrom, 
/dev/cdwriter, /dev/dvd, and /dev/dvdwriter point to that device.  Both 
cdrecord and growisofs complete without any errors, but when I try to 
remount the just-recorded disk I get an error:

[jleafey at jaybird Downloads]$ mount /media/cdrecorder/
/dev/scd0: Invalid argument
mount: block device /dev/scd0 is write-protected, mounting read-only
/dev/scd0: Invalid argument
mount: I could not determine the filesystem type, and none was specified

I have also tried to explicitly mount it specifying the device and fs type:

[jleafey at jaybird Downloads]$ sudo mount -t iso9660 /dev/scd0 \
/media/cdrecorder/
mount: block device /dev/scd0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/scd0,
        or too many mounted file systems

The output of dmesg shows the message "cdrom: This disc doesn't have any 
tracks I recognize!" when this happens.

Since I also get an error on the eject command UNLESS RUN AS ROOT 
(eject: unable to eject, last error: Inappropriate ioctl for device) I 
thought it might be a permission problem, but the device (/dev/scd0) is 
showing up as being "owned" by me, courtesy of Gnome no doubt.  I get 
the bad burns whether I run as root or a regular user.

At this point I don't know whether to think the problem is with cdrecord 
or the sata_nv driver.  Anybody got any ideas on where to look next?

Thanks!
--
Jay Leafey - Memphis, TN
jay.leafey at mindless.com
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