Write protect the disk. Use this disk to test the hard drive on your computer at home or a friend's computer. Turn the disk in for a grade. The disk will be graded on how it compares to the directory output shown. Testing for viruses in a clean field is really more complicated than this.
More recent versions test for more viruses and are too big to fit on a floppy disk.
Variations in machine setup may also complicate booting from a floppy disk. Check your operating manual and virus testing software to do this correctly. Storage and transfer of information Serial vs. parallel transmission. One byte is enough to represent a character, such as a letter, number, etc. Relate to 2-tick odometer for conversions to decimal.