If your CD/DVD device is not detected anymore as a Source or Target in DiscWrite, but works properly in Windows, the Gear drivers (specific CD/DVD drivers used by DiscWrite to control the device) might be corrupted.
You can also get "Unable to open ASPI driver GEARASPI64.dll" error message.
Make sure it When opening DiscWrite, you get an error message : Cannot open CD-R Interface. Selected interface type not supported (error 2355)
Then when clicking OK, your optical drive is not available in the Target drop down menu.
To completely uninstall the gear drivers :
Your CD/DVD device should now be detected by