From MEPIS Documentation Wiki
If you have used Windows in the past, you will probably be used to inserting a floppy and saving/reading your data directly. Under Linux the process is different. You may find it a little confusing at first: you put your floppy or CD into the drive and start wondering why you cannot access it! This is because your floppies and other storage devices (e.g. USB keys, CDs) must be attached to an existing directory on your system before they can be accessed. This attaching is called mounting. After the device is mounted, you can access the files on that device by accessing the directory where the device is attached.
How to save
Before saving information to the disk right click on the 'floppy' icon on your desktop and click 'mount'.
You can then save files to the floppy by going to media:/fd0 which it the equivalent of the /a: drive in windows
Before you remove your floppy you must unmount it; so, when you have saved your files, right click again on the 'floppy' icon and select 'unmount'. Note: You will not be able to unmount the device if you have a browser window or application open that is using the mounted device!
To save a file to a floppy disk that can be read on a Windows machine, it needs to be DOS formatted. To do this use Kfloppy.
1. Click KMenu --> Utilities --> Peripherals --> Floppy formatter (Kfloppy)
2. Top three boxes are automatically filled (change if needed):
*Floppy drive: Primary *Size: 3.5" 1.44MB *File system: DOS *Formatting: Full format
3. Click on 'Format' button
4. You can now follow the instructions above to save your files to the floppy.