Why not use the cloud? Like Dropbox, Skydrive, Google docs. You put it on and invite the others to download those files.
Kees
Hi everyone,
Here's the picture. I have an external HDD with files that I pass around. I would like other users to see and read the files inside the HDD, but I do not want them to modify or delete the files by accident.
I need a software that can write protect my external HDD and it has to work on any OS (Mac/ Windows not necessary on Linux).
I have spend the whole day googleing for a software but all I can find are software that work only on Windows. And I'm not looking for encryption software as I need the files to be viewable.
Thank you.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic