Applies to Data ONTAP 7-mode Description Security Descriptor Definition Language (SDDL) is the file used to define permissions on an NTFS volume, or the Storage Level Access Guard. (SLAG) permissions ...Applies to Data ONTAP 7-mode Description Security Descriptor Definition Language (SDDL) is the file used to define permissions on an NTFS volume, or the Storage Level Access Guard. (SLAG) permissions on either Unix or NTFS style volumes. You can use the NetApp Secedit Tool to create an SDDL file, or you can use any text editor to create one by hand.