Shrinking files?

[Powman]

Is there a way to make files smaller in any way? Perhaps for media files you could decrease quality. But are there any programs availible for such a thing?
I'm trying to fit some files on to an external drive. Thanks for the help.

 

[The_Other_One]

Search around videohelp.com for a program called Super. It will basically convert any format to any other format. It works well for converting stuff for say my PDA

 

[PC eye]

When you place files into an archive like a zip or rar file there is a degree of compression seen there with the program like Winzip for zip files and Winrar for both zip and rar files.