Data life

I just buyed a passport 320 and i stored my data on it !

Now the Q is how long my data will last if i dont use it ?

It does not have a expiration date, as long as the drive works the data will remain on it (unless you format the drive)

You do not want the drive to be the only place important fioes are stored. Important data needs to be kept in at least 2 diferent places.