Hi again,
thank you all for your answers.
@menotu: Yes, automount is activated. But a good and simple guess

thanks
@kjpetrie: I didn't try to play something, I tried to mount it and therefore I just plugged it and waited, 'cause every USB Device I connected responded with PCLOS in some useful way, but thanks this is good to know and your right Windows7 can't charge and play at the same time. Thank god I have neighbors with proprietary operating systems in the same network

@muungwana: It seems that PCLOS found something here is the quote:
<dmesg | tail -n 50
<ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
<NET: Registered protocol family 17
<martian source 255.255.255.255 from 192.168.2.2, on dev eth0
<ll header: ff:ff:ff:ff:ff:ff:00:13:f7:10:57:31:08:00
<eth0: no IPv6 routers present
<usbcore: registered new interface driver snd-usb-audio
<agpgart-nvidia 0000:00:00.0: AGP 3.0 bridge
<agpgart-nvidia 0000:00:00.0: putting AGP V3 device into 8x mode
<nvidia 0000:02:00.0: putting AGP V3 device into 8x mode
<NVRM: Your system is not currently configured to drive a VGA console
<NVRM: on the primary VGA device. The NVIDIA Linux graphics driver
<NVRM: requires the use of a text-mode VGA console. Use of other console
<NVRM: drivers including, but not limited to, vesafb, may result in
<NVRM: corruption and stability problems, and is not supported.
<usb 1-4: new high speed USB device using ehci_hcd and address 3
<usb 1-4: New USB device found, idVendor=071b, idProduct=3203
<usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
<usb 1-4: Product: ARCHOS
<usb 1-4: Manufacturer: ARCHOS
<usb 1-4: SerialNumber: USBV1.00
<Initializing USB Mass Storage driver...
<usb-storage 1-4:1.0: Quirks match for vid 071b pid 3203: 80600
<scsi2 : usb-storage 1-4:1.0
<usbcore: registered new interface driver usb-storage
<USB Mass Storage support registered.
<usbcore: registered new interface driver uas
<scsi 2:0:0:0: Direct-Access Archos USBDISK User 1.00 PQ: 0 ANSI: 0
<sd 2:0:0:0: Attached scsi generic sg4 type 0
<sd 2:0:0:0: [sdc] 15990784 512-byte logical blocks: (8.18 GB/7.62 GiB)
<sd 2:0:0:0: [sdc] Assuming Write Enabled
<usb 1-4: reset high speed USB device using ehci_hcd and address 3
<usb 1-4: reset high speed USB device using ehci_hcd and address 3
<usb 1-4: device descriptor read/all, error -110
<usb 1-4: reset high speed USB device using ehci_hcd and address 3
<usb 1-4: device descriptor read/64, error -110
<usb 1-4: device descriptor read/64, error -110
<usb 1-4: reset high speed USB device using ehci_hcd and address 3
<usb 1-4: device descriptor read/8, error -110
<usb 1-4: device descriptor read/8, error -110
<usb 1-4: reset high speed USB device using ehci_hcd and address 3
<usb 1-4: device descriptor read/8, error -110
<usb 1-4: device descriptor read/8, error -110
<usb 1-4: USB disconnect, address 3
<sd 2:0:0:0: Device offlined - not ready after error recovery
<sd 2:0:0:0: rejecting I/O to offline device
<sd 2:0:0:0: [sdc] No Caching mode page present
<sd 2:0:0:0: [sdc] Assuming drive cache: write through
<sd 2:0:0:0: [sdc] Attached SCSI removable disk
<usb 1-4: new high speed USB device using ehci_hcd and address 4
<usb 1-4: device descriptor read/64, error -110
The option "advanced USB support" in the mainboard BIOS is and was enabled.
Sorry it took so long to answer...I have a lot of work and a new girlfriend ;P
Thanks alot
mutzsow