USB flash drive security on mac and windows

Hi
I've got an USB flash drive and I would like to secure it so that data on it will not be accessible unless a password is provided.
The point is that I need to use it on both my macbook with tiger OS and on another PC with windows XP.
The USB flash drive is a sandisk cruzer titanium that comes with U3. Originally I was using an U3 protection that asks for a password when the flash drive is plugged in.
U3 is not supported by MAC so I had to disable the password protection to use it on my brand new macbook.
Appreciate any help
Thanks, Ste
macbook c2d   Mac OS X (10.4.8)  

You will be able to open it if you make it a .iso
image. There is software available for both OSes to
open and browse/modify a .iso image file. I do not
know how well any of them use passwords for the
images.
Maybe it's winiso
What I would recommend is using Winrar
(http://www.rarlabs.com/) and just using a compresses
and encrypted file that both OS's can manipulate.
With winrar you create an archive and then each time you want to edit a file you have to extract it, modify it and then reinsert it in the archive.
What I was looking for is something more user friendly.
Images created with mac, protected with a password, are ok but are not compatible with windows.
Viceversa, U3 is compatible with windows but not mac ...

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