Why external CD/dvd unit not detected?

Mac Mini / Lion
Last time I connected this same external CD/DVD player it was to install Office 2011 and it was detected, and I was able to proceed with install.
Now, I just want to browse a data CD and it won't even detect the unit. I tried to reboot, nothing changed.
It's connected using dual USB (takes its power this way).
Any insight?
Thanks,

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Try seeing if http://www.patchburn.de/ solves the issue, and check http://www.xlr8yourmac.com/ for possible firmware updates as well as Samsung's own website.

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