Citation:
The following directory privilege provides secured access to the files stored in the operating system directory to which the directory object serves as a pointer. The directory object contains the full pathname of the operating system directory where the files reside. Because the files are actually stored outside the database, Oracle server processes also need to have appropriate file permissions on the file system server. Granting object privileges on the directory database object to individual database users, rather than on the operating system, allows Oracle to enforce security during file operations.
READ
Read files in the directory.
La doc oracle ne parle pas de write (alors qu'en 9i il y a un paragraphe dessus)