Just to tell you. It seems that OS X.2.4 Finder and iTunes do not support these burners for writes.
1) LG/Hitachi GCE-8320B 32x10x40 CD-RW
2) Panasonic LF-D521U DVD-RAM/-R/-RW CD-RW
Toast works fine though. It recommended my cheap 32X media be burned at 8X on the Hitachi, but it seemed to work fine at 32X (max speed). With the Panasonic it recommended its full 12X speed for CD-RW).
With the Hitachi/LG, I'm using a noname Firewire enclosure which worked fine with a Teac 24X CDRW burner with the Finder.
With the Panasonic LF-D521, I'm using a NewMotion Technology Firewire enclosure which fine with a Panasonic LF-D311 for DVD-R burning from the Finder.