It seems that at least one db to adf conversion is possible and that is for the file types used by ESRI ArcView (ArcGIS). The actual meaning of this conversion or if it's actually possible to convert db to adf could not be verified.
Home > Search converters: db to adf
Conversion of db file format to adf file format beta
Search for db to adf converter or software able to handle these file types.
Convert ArcView object database to ArcView ARC/INFO coverage data.
We have found one software suitable in our database for this conversion.
Microsoft Windows software 
- convert db to adf on Windows
ArcGIS for Desktop Basic (ArcView)
A GIS application used to work with geographic data
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from db file | No | Yes | No | No | Yes | No | No | No |
to adf file | No | No | No | No | No | No | Yes | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open db file, Open adf file
DB
Files with db extension can also be found as attribute data files from ArcView GIS software. A database-like format.
ADF
An adf file extension is used for ArcView (ArcGIS) coverage data files. ADF coverage data files are stored in one directory and create ArcGIS coverage. ArcGIS coverage is georelational data model.
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