I have a pendrive where I restore an image maked by dd command in other system. When I restore the image, always I must do a fsck. Is possbile that when I've generated the image the source system was corrupted or it is that I corrupt the pendrive when I restore the image file ? Many thanks and sorry for my English!
This is just guessing, since you do not provide much information about the creation of the image, but yes, it is possible that the file system was in an unclean state when the image was taken. It is also possible that the file system was simply still mounted at that point of time - always unmount a file system (or mount it read-only) before you take an image of it.