...Now I have to fix my usb drive, it was simple I dismantle the box and I mount it in

my desktop pc has a second drive I then run the Ultimate Boot CD, and I choose for this

mission : Testdisk.

Starting testdisk by choosing my disk, after I choose the menu "analyzing"

It show you the disk partitions, and there states or any problem, if one or more part is

missed or corrupted launch the scan and it will rebuild the correct disc structure.

I've done it and it rebuild my two partition.

It ask me if I want to write to the MBR(master boot record), I reply yes, of course.

I gain access to my disk, but the file system was damaged, my data were unreadable.

Ok, I then run PCI Filerecovery and with this terrible free tool I gain access to my data,

and more(yes sometime, you can retrieve data of an older installation...or recover data

from the trash).

So easy.