USB devices doesn't appear

Hi
I've installed arch in the last few days, everything is almost fine.
The only problem is about the usb devices (like my pen and mobile modem). The system finds them, but they doesn't appear in /dev/sdX
lsusb shows me that the usb is there, but nothing else happens.
dmesg shows me this:
usb 2-2: new high speed USB device using ehci_hcd and address 2
usb 2-2: configuration #1 chosen from 1 choice
Initializing USB Mass Storage driver...
scsi2 : SCSI emulation for USB Mass Storage devices
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usb-storage: device found at 2
usb-storage: waiting for device to settle before scanning
usbcore: deregistering interface driver usb-storage
lsmod | grep usb
btusb 9768 0
bluetooth 44621 1 btusb
usbserial 27170 0
usbcore 118921 6 uvcvideo,btusb,uhci_hcd,ehci_hcd,usbserial
My user is in storage group.
And i can mount CD and DVD.
If anything else is needed i will post here.
Can anyone help me?
thnaks

if you run
udevadm info
in a terminal and then I just tried on my computer, [rene@ArchLounge ~]$ monitor will print the UDEV - the event which KERNEL - the kernel uevent
KERNEL[1264631862.534890] add KERNEL[1264631862.535070] add KERNEL[1264631862.535281] add KERNEL[1264631862.535306] add UDEV [1264631862.545583] add UDEV [1264631862.545810] add UDEV [1264631862.545897] add UDEV [1264631862.546004] add KERNEL[1264631867.534455] add KERNEL[1264631867.534481] add KERNEL[1264631867.534492] add KERNEL[1264631867.534502] add KERNEL[1264631867.534655] add KERNEL[1264631867.534680] add UDEV [1264631867.534920] add UDEV [1264631867.536591] add UDEV [1264631867.536612] add UDEV [1264631867.536623] add KERNEL[1264631867.537005] change UDEV [1264631867.538299] add UDEV [1264631867.538721] add UDEV [1264631867.538933] change KERNEL[1264631867.540308] add KERNEL[1264631867.540365] add KERNEL[1264631867.540578] add UDEV [1264631867.540589] add UDEV [1264631867.628087] add UDEV [1264631867.668981] add insert a usb drive, what is displayed?
and I got the following:
udevadm monitor
received events for:
udev sends out after rule processing
/devices/pci0000:00/0000:00:02.1/usb1/1-1 (usb)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0 (usb)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/scsi_host/host10 (scsi_host)
/devices/pci0000:00/0000:00:02.1/usb1/1-1 (usb)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0 (usb)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/scsi_host/host10 (scsi_host)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_disk/10:0:0:0 (scsi_disk)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_device/10:0:0:0 (scsi_device)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_generic/sg5 (scsi_generic)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/bsg/10:0:0:0 (bsg)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_disk/10:0:0:0 (scsi_disk)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_device/10:0:0:0 (scsi_device)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_generic/sg5 (scsi_generic)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/bsg/10:0:0:0 (bsg)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/block/sdd (block)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/block/sdd/sdd1 (block)
/devices/virtual/bdi/8:48 (bdi)
/devices/virtual/bdi/8:48 (bdi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/block/sdd (block)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/block/sdd/sdd1 (block)

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