Try a known-working optical drive -- the common thread is the CD/DVD reader.  
I have a Dell D610. It is not my main computer but my 3rd or 4th in line of use. I have only one HD it will recognize. All the others do not show up. The ones I want to use have larger capacity. One 80 and one 100. What is the best way to format or get them ready for an OS or upgrade? When I connect them via USB cable to my other two Dells they show up. Need some help from you Dell experts.
D610