New in version 1.9.0.

caseSensitiveFS is an advanced folder setting that affects file name handling. When set to true the extra safety checks for case insensitive filesystems are disabled, reverting the behavior to that of Syncthing 1.8.0 and earlier. With the safety checks enabled (caseSensitiveFS = false, the default) Syncthing will attempt to detect and prevent case-only file name collisions that can occur on case insensitive systems such as Windows and macOS, or other systems with case insensitive file systems.


This option should normally be set to false. It is not meant to change the basic principles how Syncthing handles case-sensitivity, but only provides a performance optimization when the underlying filesystem is positively known to be case-sensitive already.