Whether those device nodes are correct is going to depend on your hardware and how specifically the devices are enumerated by the BIOS.
Also, some BIOSes renumber things when external devices are connected. I’ve seen some where they boot find when the HDD is the only device connected but then when you put a USB key in and boot, the HDD is pushed to HD1. I’m working on a fix for that but in the meantime if you just make sure that the HDD is the only block device in the system, that may help.
Drew