Well the scare should still prompt you to take action on a back-up and recovery strategy to cater for the worst case scenario drive failure. I have a hard disk imaging tool called Drive Image 7 (bought out by Symantec), which can take an exact copy of a hard disk partition or clone a drive, there are other drive imaging products out there unfortunately I have no experience of these. Some require that .net framework is installed as does Drive Image 7.

As part of my regular maintenance I take a weekly image of my two partitions on my Primary Drive 0 and copy that to my Second Hard Drive, I can also if I wish copy the image to DVD. I also do daily back-ups of volatile data files and stuff I don’t want to lose as I mentioned above. This makes it easy to recover from almost any disaster in very short order.

What is the device that is being reported as unknown ?
From the same listing it is showing only CD ROM drives and you can’t back anything up to those they are read only devices, you can’t write to them.