question about usb CD

I'm in the process of ripping my CD collection using grip.  Up front I should mention that I'm using HAL to automatically mount DVDS, usb, etc. Right now I'm using /dev/hdb, an AT drive, to read the CDs.  In the grip configuration, the read drive is /dev/cdrom, which works fine.   I would like to use my usb CD burner in addition, using --device modifier to grip, which would make the whole process go faster.  I thought I could use /dev/sr0, but grip doesn't see that.  What should I be using for the usb device? -- Research is what I'm doing when I don't know what I'm doing. -- Wernher von Braun