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For ATAPI CD/DVD devices (to date): I never seen a serial number in the IDENTIFY PACKET DEVICE data and I've never noticed a serial number returned in the SCSI INQUIRY data either.
Try Iomega REV drives, both op xA1 Identify and op xA0:12 Inquiry.
PDT = x05 = DVD/CD, but serialized (at zero recurring cost) same as Iomega Zip drives.
P.S. USB Mass Storage flatly requires device serialization for every device except USB 1 FS HDD, because in 1998 BIOS folk thought they could demand help in knowing if they were booting from A: or B:. People who sell ATAPI devices, especially bootable devices, into the USB/ATAPI bridge market consequently may decide to serialize their ATAPI devices, whenever that serialization does have zero recurring cost.
Pat LaVarre http://udfko.blog-city.com/read/732116.htm
