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I am able to access the additional optical drives, but drives "T:" and "U:" are the same (Victor, is this the same behavior you see in your tests?).
Yup. T: is claimed by the eltorito driver. You need to choose the option that says "mount all, _except_ eltorito" to get rid of the duplicate drive letter.eltorito.sys mounts the boot CD with BIOS's support. It doesn't need to worry about the hardware interface structure (IDE,SCSI,SATA,USB etc.).
The other CDROM drivers will mount whatever CDROM drives they find with the supported hardware interfaces.
That's why you are getting drive letters mapping to the same CDROM drive.