Complete Newbie Question

I am in a test environment where i need to test several versions of UNIX, such as linux, solaris, SCO (ODT and Unixware). What i would like to know is there a universal way to work with the contents of a floppy diskette? I know some give you dos-like commands, but am looking for a way to access and copy files to and from floppies using Unix commands. Thanks

TAR will work between the different platforms.