Files
[ID_FILE  ]<=\ <========\
[NAME_FILE]  |          |
[ID_FATHER]__|          |
[FILE_TYPE]___________  |
[ID_CD    ]__         | |
             |        | |
CDs          |        | |
[ID_CD    ]<=/        | |
[MORE_SHIT]           | |
                      | |
File Type             | |
[ID_TYPE  ]<=========/  |
[FILE_TYPE]<=======\    |
                   |    |
                   |    |
Each type has a    |    |
table with his own |    |
attrs              |    |
[ID       ]        |    |
[ID_TYPE  ]________|    |
[ID_FILE  ]_____________|
[MORE_SHIT]