1. Faulty floppy disk
2. Faulty floppy drive
3. Floppy disk may be full or has less memory
4. Floppy disk may be disabled
5. Floppy disk may be disconnected
6. Software fault
7. Virus in computer
8. Choosing of wrong device while saving the work
raphael answered the question on September 14, 2017 at 08:04