Hey! I am going to buy an external HDD, but first need some help. I am converting videos to Xvid on my PC, to put on my portable media player. Now, as this media player has 30gb, and I would like to put more videos on it than it will hold, I was thinking of putting all the movies on the external HDD, and then switching them around when I go on holiday using my macbook, If I want to watch one that is not already on the player. Now, is it possible to use an external hdd (read/write) on a mac and on a pc?