Bingo! The Dell USA support site has a new firmware for the ND-1100 which
1) Improves writability of black CD-R media
2) Improves readability and writability of DVD+RW media
You'll need to create an account with Dell support, then search for downloads and drivers for the Dell Dimension 2400. Look under "Removable Media Storage Devices". Note: they also have a Roxio patch to version 5.3.4 if you're not up to that particular level ("Patches and Fixes").
If you choose to go that route, you can download the updater application and be very careful to follow the directions explicitly. Alternatively, you can either replace the drive (a possible end result of a failed firmware update in any event) or swap the discs with someone whose drive
will read them.
Optical drives are tested on the media avcailable at the time of release; media released subsequent to that (such as the Fuji PhotoDisc and other black substrate media) may not work well, or at all. And what works in one model drive won't necessarily work in another. Short of a compatibility list (which NEC USA has lost in a site reorganization, but NEC UK doesn't even list the ND-1100), there's no way of being sure a given brand name will work. And "house brands" may actually be made by ['i]any[/i] manufacturer, so you may get different results from spindle to spindle.