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I'm not sure I'm with you, I just took the ext card from the asus, installed it in the p900 and loaded all my files from the card to the internal memory with no problem. Then I went to the settings and selected the set storage location and it gave me the option to use the ext card. Now I'm caught up, the ext card errors out as read only when I tried to backup to the ext card.

Edit: I just found a post that says the app has to 'request' to write to the external card. So it looks like the ball is passed to Mike [unless you root].

I totally agree with you on device use. At the minimum they should have given us the option between the two ways or described how a user could change to r/w.