How does a USB pen drive get infected by viruses? As pen drive is the most convenient way of transferring data from one system to another, it is very prone to virus infection. Shortcut virus like Trojan horse generic32.tnu will either cause inaccessibility of files or makes them hidden from Windows Explorer. Viruses are the most dreadful programs that alter data on storage devices making it corrupt and inaccessible. The only solution to get rid of this issue is first remove shortcut virus from your USB drive without losing data files, and then use Yodot Hard Drive Recovery, a reliable data recovery software to recover files affected with shortcut virus.
When your USB drive is affected by shortcut virus, all it's files and folders will become shortcuts, which you cannot access or open.