USB in BIOS

[RRHODY]

Have Z61t type 9440. BIOS Startup shows USB FDD and USB CD as normal. the entry for HDD is different; it is -USB HDD. What is the significance of the dash? I've been trying to clone via the USB and it is not working properly. Acronis and XXClone find the drive that's connected via USB and will clone to it, but the cloned drive won't boot. Is the dash USB the problem?