I have a problem with my HD external (Philips, and running on WinXP) because I 
can't access to the hd. No device is created. I thought that /dev/sda it's 
created.
When I insert the two usb connector (one for data and the other for power) the 
dmesg is :

usb 3-2: new high speed USB device using ehci_hcd and address 6
scsi2 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 6
usb-storage: waiting for device to settle before scanning

Here I must wait for 10-20 Seconds and after

hub 3-0:1.0: over-current change on port 1
usb 3-2: reset high speed USB device using ehci_hcd and address 6
scsi: Device offlined - not ready after error recovery: host 2 channel 0 id 0 
lun 0
usb-storage: device scan complete


When I connect only the data connector :

hub 3-0:1.0: over-current change on port 1
usb 3-2: new high speed USB device using ehci_hcd and address 7
scsi3 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 7
usb-storage: waiting for device to settle before scanning

Here I must wait for 10-20 Seconds and after

usb 3-2: reset high speed USB device using ehci_hcd and address 7
scsi: Device offlined - not ready after error recovery: host 3 channel 0 id 0 
lun 0
usb-storage: device scan complete

So the Log it's quite the same, and the results too.
The modules for usb are loaded :

ehci_hcd               31016  0
ohci_hcd               20804  0
usbcore               111644  7 
usb_storage,usblp,usbmouse,usbhid,ehci_hcd,ohci_hcd
sg                     35676  0
usb_storage            82756  0
scsi_mod              123784  2 sg,usb_storage

Thanks for any support
Stefano Negro
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