F7T4: Weird USB disk problems (a mount problem)

[Guido Ledermann <guido ledermann googlemail com>]

Hello,

today I've faced a very weired problem. Whenever I plug in my USB stick 
or ma CF card with pictures of camera they are mountred as usual. But 
when I plug my USB disk I only see in /var/log/message that it's known 
as sdd/sdd1 but it doesn't show up. I'm sure it did a few days ago. What 
can be the difference between the stick and the hard drive?

Guido