Don't worry about the fact that windows continually refers to the drive as a CDROM device or uses drivers that seem to be for CDROM drives. The fact is, windows treats DVD and CDROM drives as the same thing. The same drivers are typically used. There is nothing wrong with that. One of my machines continually refers to my BenQ 1640 as a CD device and it works fine. So rest easy about all the "CDROM" references.
There are three things you can try :
1) If your system uses nVidia's IDE drivers, uninstall them and let windows load up it's own default IDE drivers (happens automatically when the machine reboots after you uninstall nVidia's IDE drivers). nVidia's IDE drivers are buggy and have been known to cause all kinds of strange problems with DVD writers.
2)Change the IDE cable. This may just be a case of a defective IDE cable. Try using an 80-wire cable as I suspect the H20L is a UDMA4 device.
3)Boot into safe mode and test the drive. Could be some rogue drivers interfering with the drive reading discs. Booting into safe mode usually bypasses the loading of most third party drivers.
Note that some DVD movie discs cannot be accessed using Windows explorer. They show up as blank discs instead due to some form of copy protection. Upon using DVD playing software (e.g. VLC, Cyberlink PowerDVD), the disc is playable.
If none of these work, let us know. There are one or two more tests that can be run before we assume that the drive is faulty.