Annoying pop-up window

[Renaud OLGIATI (Ron)]

Whenever I plug in a USB external drive, I get a pop-up window advising me that "Removable medium is inserted...Select the action..."

This is an anoyance, since the drive appears in the Places of PCManfm, and can be mounted there.

Is there a way to prevent the pop-up ?
 
Cheers,
 
Ron.

Debian Wheezy, XFCE 4.8.0.3
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