I didnt' give any news about my configuration problems because of other 
probs now solved :)
So, I have something new :
$ cat /proc/scsi/scsi 
Attached devices:
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: ST3160827AS Rev: 3.42
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: USB2.0 Model: CF CardReader Rev: 
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 00 Lun: 01
Vendor: USB2.0 Model: CBO CardReader Rev: 
Type: Direct-Access ANSI SCSI revision: 02

So it seems that the reader is referenced somehow there.
How could I use thes infos to make it work ?

I've played with this little help :
http://www.fedora-france.org/modules/wfsection/article.php?articleid=58
by typing :

echo "scsi add-single-device 2 0 0 1" > /proc/scsi/scsi

But it didn't work


Thanks for the help.