Computer Viruus Makes USB Files Disappear

Thought I'd drop this in because this month have had a couple teachers at work "lose" the files on their USB. The USB looks blank but if you check the properties you will see that the USB still has data bu that the data is invisible. I have seen this called the "Shortcuts Virus". It changes the attributes of the files to make them invisible. The fix isn't too complicated.
1. Insert the USB and scan for viruses. I use the free version of AVAST.
2. Delete any viruses (clean if they are important files!
3. Start>run  push enter
4. type   cmd and press enter, this brings up the dos window
5. type this;

attrib -h -r -s /s /d g:\*.*

The letter g should be replaced with the letter of you USB drive if it does notshow up as g in your computer
press enter
wait for it to complete, close the window
your files should now be accessible