### What about this file deduplication thing?
-Jirafeau uses a very simple file level deduplication for storage optimization.
+Jirafeau can use a very simple file level deduplication for storage optimization.
This mean that if some people upload several times the same file, this will only store one time the file and increment a counter.
In order to know if a newly uploaded file already exist, Jirafeau will hash the file using md5 by default but other methods are available (see `file_hash` documentation in `lib/config.original.php`).
+This feature is disabled by default and can be enabled through the `file_hash` option.
+
### What is the difference between "delete link" and "delete file and links" in admin interface?
-As explained in the previous question, files with the same hash are not duplicated and a reference counter stores the number of links pointing to a single file.
+When file deduplication feature is enabled, files with the same hash are not duplicated and a reference counter stores the number of links pointing to a single file.
So:
- The button "delete link" will delete the reference to the file but might not destroy the file.
- The button "delete file and links" will delete all references pointing to the file and will destroy the file.