If you use a USB stick on a Mac, then insert it in to a Windows machine on-campus you will be prompted to choose whether to encrypt or not to encrypt the USB.
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If you choose not to encrypt you will still be able to open files on the USB and copy files from it, but you will not be able to save files or copy files to the USB. Your USB will still work on your Mac.
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If you choose to encrypt the USB in a Windows 7 machine you will be able to save work to it but you will not be able to subsequently use the USB in your Mac.
Alternative Methods for Transporting Files
Alternative ways to move or access files include:
Mac Encryption
Mac OS X Lion also provides an option to encrypt USBs. However, if you encrypt a USB in this way, the USB will not work on any Windows PCs or on any previous Mac versions.