sorry for the confusion and i admit i made a mistake but i remember i saw it somewhere here

Edit : I have found the two solution :

1. Plug the in the pc on mass storage mode and unplug it
OR
2. Terminal way : tracker-control -r to force a full rebuilt when you lunch gallery or music player

Edit 2 : Please remember that using
"tracker-control -r" will also
delete all contacts, all feeds,
all chat messages and all
sms from your phone.