OK, here's the story:
The drive that I was trying to use was a HP 9300+, a SCSI device. So in:
HKEY_LOCAL_MACHINE\Enum\SCSI
was
HKEY_LOCAL_MACHINE\Enum\SCSI\HP______CD-WRITER+_9300_1\MF&CHILD0001&PCI&VEN_8086&DEV_244B&SUBSYS_00000000&REV_02&BUS_00&DEV_1F&FUNC_0110\HardwareID
which contained:
HP______CD-WRITER+_9300_1,GenCD,SCSI\HP______CD-WRITER+_9300_1
(for my device. The first part it the only one we want)
This told me what identification Windows had applied to the SCSI based CDRW. Now, if you are using IDE then it should be located in:
HKEY_LOCAL_MACHINE\Enum\ESDI
and a entry for the writer should be there, and in that entry should be the Class ID, and in THAT entry on the right hand side should HaredareID which will tell you the name of the device. Then look at the Device Manager\CDROM to confirm the way Windows sees it.
I had EasyCD Creator 3.5, so in:
HKEY_LOCAL_MACHINE\Software\Adaptec\Easy CD Creator\Devices
you will find entries for every device supported. Now hopefully you either
(a) know the manufacturer of the drive, not just the name on it. For instance, it worked out that the HP 9300+ was actually a Sony type 5004. It turned out that most HP's are Sony's, as the Device table shows
(b) you have a brand-name drive. In that case go to the correct entries in the Device table (they are alphabetical).
So I scrolled down to the 'HP' entries and found a entry for the 9200 listed as device177
HP CD-Writer+ 9200,HP,CD-Writer+ 9300,SONY5004,cdrmmc.drv,130
and simply changed it to read:
HP CD-Writer+ 9300,HP,CD-Writer+ 9300,SONY5004,cdrmmc.drv,130
Voila! Instant drive support!
A little confusing, I know. The jist of it is find out what Windows names the drive and then hack a pre-existing entry (the easiest way) in CD Creator's Device database to match the name (the first part of the entry) and also have the correct entry for the device (the second part).
If the drive has a manufacturer's name in the Device Manager entry then it is easier - go to similiar entries and hack away. If not you'll have to try one of the Generics and go from there.
Let me know your specifics and I'll help any way I can! Your mileage may vary...