I offered this picture as proof of one of a few ways we can create your issue.
You saw it shows up as a drive. Imagine if someone had checked off the don't ask me again button and selected the disk drive option. Remember I'm just a Windows Mobile programmer. I'm not a device expert. I happen to have the htc pro 2 w/wm 6.1 here for testing with my software so I thought I'd look at this fast.
I hope that's it and you find a way to uncheck that box.