transport protocal

hi! is the transport protocal in the usb-storage effect the packet-cd? i try the USB cdrw , they are acer 4406 , acer 6424 , and IODATA cdrw , they can work on the packet-cd , their transport protocal in the usb-storage is the cb(i)\\8020i , but i try the HP 8230e , IOMEGA ZIPCD 650 , and some usb mobilebox , they can not work with the packet-cd , and their 's transport protocall is not the cb(i)\\8020i , so , i don't know it is the usb-storage's problem or the packet-cd's problem that the HP and IOMEGA USB cdrw can not work thanks