How to monitor file system in MAC

Hi,

has anyone found solution for using filesystemwatcher or something similar in MAC? I try to monitor if USB-stick has been inserted.

FileSystemWatcher is working in linux and windows, but not in MAC. Events are not raised.

 using System;
 using UnityEngine;
 using System.Collections;
 using System.IO;
 using System.Security.Permissions;
 
 public class Watcher : MonoBehaviour {
     public string fileToWatch = "*.*";
     public string Path = "/Volumes";
     private FileSystemWatcher watcher;
     
     [PermissionSet(SecurityAction.Demand, Name="FullTrust")]
     void Start ()
     {
         watcher = new FileSystemWatcher ();
         watcher.Path = Path;
         watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
             | NotifyFilters.FileName | NotifyFilters.DirectoryName;
         watcher.Filter = fileToWatch;
         watcher.Renamed += new RenamedEventHandler (OnRenamed);
         watcher.Changed += new FileSystemEventHandler (OnChanged);
         watcher.Created += new FileSystemEventHandler (OnChanged);
         watcher.Deleted += new FileSystemEventHandler (OnChanged);
         watcher.Error += new ErrorEventHandler(OnError);
         
         watcher.IncludeSubdirectories = true;
         watcher.EnableRaisingEvents = true;
     }
 
     public void OnChanged (object source, FileSystemEventArgs e)
     {
         WatcherChangeTypes wct = e.ChangeType;
         Debug.Log (e.FullPath + ": " + wct.ToString ());
     }
     
     public void OnRenamed (object source, RenamedEventArgs e)
     {
         WatcherChangeTypes wct = e.ChangeType;
         Debug.Log ("file " + e.OldFullPath + " renamed to " + e.FullPath + ": " + wct.ToString ());
     }
     
     public void OnError(object source, ErrorEventArgs e)
     {
         Debug.Log("Error detected: " + e.GetException().GetType().ToString());
     }
 }