is it possible to use encrypted usb hdd

[swinxx]

No. I mean that i format the hdd with osx, then make journaled partition and encrypt it incl password protection. Then i put some media on it like films and so on...
When i then start the raspberry with xbian on my sd card, is it possible to read the media from the usb when i plug it into the rasp??

I can remember that the discs must be formatted ntfs..? Or is that wrong ??

Thx and greets, re