thks a lot for your reply. Here is the result of the format with the HP tool :
[img=left:62f629e17d]http://sweb.cityu.edu.hk/50654581/result.jpg[/img:62f629e17d]
Actually 2 Gb... Do you understand this ??
I'm now testing the available size.. takes time as it behave like USB 1.0..
another problem.