diff --git a/src/slic3r/GUI/RemovableDriveManager.cpp b/src/slic3r/GUI/RemovableDriveManager.cpp
index 166728e68b..8145c90760 100644
--- a/src/slic3r/GUI/RemovableDriveManager.cpp
+++ b/src/slic3r/GUI/RemovableDriveManager.cpp
@@ -218,11 +218,11 @@ INT_PTR WINAPI WinProcCallback(HWND hWnd, UINT message, WPARAM wParam, LPARAM lP
 #else
 void RemovableDriveManager::search_for_drives()
 {
-    
+ /*
 #if __APPLE__
 	list_devices();
 #endif
-
+*/
 	m_current_drives.clear();
 	m_current_drives.reserve(26);
 
@@ -389,6 +389,8 @@ void RemovableDriveManager::init()
 	add_callback([](void) { RemovableDriveManager::get_instance().print(); });
 #if _WIN32
 	register_window();
+#elif __APPLE__
+    register_window();
 #endif
 	update();
 }
@@ -493,4 +495,4 @@ void RemovableDriveManager::print()
 	//std::cout << "Removed Device: "<<(int)is_last_drive_removed()<<"\n";
 	std::cout << "notified\n";
 }
-}}//namespace Slicer::Gui::
\ No newline at end of file
+}}//namespace Slicer::Gui::
diff --git a/src/slic3r/GUI/RemovableDriveManager.hpp b/src/slic3r/GUI/RemovableDriveManager.hpp
index 04bbe48b5d..c4f55029b7 100644
--- a/src/slic3r/GUI/RemovableDriveManager.hpp
+++ b/src/slic3r/GUI/RemovableDriveManager.hpp
@@ -55,10 +55,12 @@ private:
 	void *m_rdmmm;
 	void register_window();
 	//void list_devices();
+    void search_path(const std::string &path, const std::string &parent_path);
+    bool compare_filesystem_id(const std::string &path_a, const std::string &path_b);
 #else
 	void search_path(const std::string &path, const std::string &parent_path);
 	bool compare_filesystem_id(const std::string &path_a, const std::string &path_b);
 #endif
 };
 }}
-#endif
\ No newline at end of file
+#endif
diff --git a/src/slic3r/GUI/RemovableDriveManagerMM.mm b/src/slic3r/GUI/RemovableDriveManagerMM.mm
index e4e324654e..99abd73860 100644
--- a/src/slic3r/GUI/RemovableDriveManagerMM.mm
+++ b/src/slic3r/GUI/RemovableDriveManagerMM.mm
@@ -1,37 +1,38 @@
 #import "RemovableDriveManager.hpp"
-
+#import "RemovableDriveManagerMM.h"
 #import <AppKit/AppKit.h> 
 
 @implementation RemovableDriveManagerMM
 
-namespace Slic3r {
-namespace GUI {
+
 
 -(instancetype) init
 {
 	self = [super init];
 	if(self)
 	{
-		[self add_unmount_observer]
+        [self add_unmount_observer];
 	}
 	return self;
 }
 -(void) on_device_unmount: (NSNotification*) notification
 {
     NSLog(@"on device change");
-    RemovableDriveManager::get_instance().update();
+    Slic3r::GUI::RemovableDriveManager::get_instance().update();
 }
 -(void) add_unmount_observer
 {
+    NSLog(@"add unmount observer");
     [[[NSWorkspace sharedWorkspace] notificationCenter] addObserver:self selector: @selector(on_device_unmount:) name:NSWorkspaceDidUnmountNotification object:nil];
 }
-
+namespace Slic3r {
+namespace GUI {
 void RemovableDriveManager::register_window()
 {
 	m_rdmmm = nullptr;
 	m_rdmmm = [[RemovableDriveManagerMM alloc] init];
 }
-
+}}//namespace Slicer::GUI
 
 /*
 -(void) RemovableDriveManager::list_devices()
@@ -65,4 +66,5 @@ void RemovableDriveManager::register_window()
 	}
 }
 */
-}}//namespace Slicer::GUI
\ No newline at end of file
+
+@end