[arch-general] usb disk not visible

[Andrea Crotti]

I have a problem with an external USB disk here, which is a WD 500Gb
bought last year.

Recently I decided finally to format it to ext3, since I'm using Linux
everywhere, but now I don't seem to see it from my dell latitude.

On my mini dell everything works perfectly, but on the latitude I get
only this from dmesg

[ 8916.825474] usb 2-1.2: USB disconnect, device number 11
[ 8917.013895] usb 2-1.2: new high-speed USB device number 12 using ehci_hcd
[ 8919.126604] usb 2-1.2: USB disconnect, device number 12
[ 8919.314274] usb 2-1.2: new high-speed USB device number 13 using ehci_hcd

and fdisk doesn't detect anything:
[andrea at dell]$ sudo fdisk -l /dev/sdb

Any idea of what it could be?