Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/screenlets/__init__.py", line 1460, in expose
    self.on_draw(ctx)
  File "/usr/share/screenlets/Sysmonitor/SysmonitorScreenlet.py", line 459, in on_draw
    a = sensors.disk_get_usage(i)
  File "/usr/lib/python2.5/site-packages/screenlets/sensors.py", line 356, in disk_get_usage
    res = commands.getoutput('df -h -a -P').splitlines()
  File "/usr/lib/python2.5/commands.py", line 44, in getoutput
    return getstatusoutput(cmd)[1]
  File "/usr/lib/python2.5/commands.py", line 54, in getstatusoutput
    text = pipe.read()
IOError: [Errno 4] Interrupted system call