[H] DVD Formats

[Steve Tomporowski]

I'm just starting to look into this, but maybe someone here knows the answer already.  I have a set-top DVD Burner, a Samsung DVD-R120.  Got it for only 80 bucks and used it hooked up to a VCR to copy over tapes.  Does a pretty good job.  However, I recently slapped it into my computer (actually both computers) and neither sees the disk at all.  Doesn't play and won't show up any file listing (MCE just hangs).  Do set-top DVD recorders use some sort of different format?  I'm using the same disks for all my DVD burners (-R).

Thanks....Steve