SQL> select * from all_directories where directory_name = 'DBA_DIR';

OWNER                          DIRECTORY_NAME
------------------------------ ------------------------------
DIRECTORY_PATH
--------------------------------------------------------------------------------
SYS                            DBA_DIR
E:\Oracle\product\10.1.0\oradata\DBADB\EXPDB

2. SQL>  Select * from user_tab_privs
               Where table_name = 'DBA_DIR';

GRANTEE     OWNER    TABLE_NAME  GRANTOR   PRIVILEGE    GRANTABLE     HIE

SYSTEM      SYS       DBA_DIR    SYS       READ             YES         NO

SYSTEM      SYS       DBA_DIR    SYS       WRITE       YES         NO

RSH         SYS       DBA_DIR    SYS       READ               NO          NO

RSH         SYS       DBA_DIR    SYS       WRITE               NO          NO      

3. verified  physical directory in server also is there.