DVD/CD player wont stop!

I have the same problem. I have a Dell Dimension 4600i with a SAMSUNG DVD-ROM SD-616E drive and a TEAC DVD+RW DV-W58E drive. I also have Sonic Record Now! v 6.5. 

 

This occurs with pre-recorded DVDs in both drives (it doesn't seem to happen with pre-recorded audio CDs) The read/write light isn't on, but the drive is definately spinning the disk (I can hear it). And now I've been noticing it happening with CDs that I've burned. If I leave one in the drive(s), the drive will periodically (like every 8 minutes or so) start spinning for a minute or so, and then stop (it seems to only happen with disks burned in the UDF format, but not CDFS).

 

 Not the biggest deal in the world but still kind of annoying.