xbmc tries to mount my usb2 hub/cardreader:

20:26:24 M: 46600192   DEBUG: CMemoryUnitManager::Update Reports added device 00000004 and removed device 00000000
20:26:24 M: 46600192  NOTICE: Attempting to mount memory unit device 00000004
20:26:24 M: 46600192   DEBUG: CMemoryUnitManager::MountDevice Creating MU device (port 2, slot 0)
20:26:24 M: 46600192   DEBUG: CMemoryUnitManager::MountDevice Getting MU device (port 2, slot 0)
20:26:24 M: 46600192   DEBUG: CFatXDevice::Mount Attempting to open as FATX volume
20:26:24 M: 46567424   DEBUG: CFat32Device::Mount Reading MU disk geometry
20:26:25 M: 46604288   DEBUG: CFat32Device::~CFat32Device Killing our cache

same session, a usb memstick inserted into the hub:

20:29:24 M: 37695488   DEBUG: CMemoryUnitManager::Update Reports added device 00040000 and removed device 00000000
20:29:24 M: 37695488  NOTICE: Attempting to mount memory unit device 00040000
20:29:24 M: 37695488   DEBUG: CMemoryUnitManager::MountDevice Creating MU device (port 2, slot 1)
20:29:24 M: 37695488   DEBUG: CMemoryUnitManager::MountDevice Getting MU device (port 2, slot 1)
20:29:24 M: 37695488   DEBUG: CFatXDevice::Mount Attempting to open as FATX volume
20:29:24 M: 37695488   DEBUG: CFatXDevice::Mount Success opening FATX volume