this mean your pen drive infected by virus, at my experience your file not lost but just the virus hidden your file and change the file attribut as system, and because of that your computer not show your file
scan your pen drive using anti virus, i usually use
smadav anti virus, this is the local antivirus at indonesia (indonesia is my country)
download smadav antivirus at
http://smadav.net
after download double click smadav antivirus and click start scan, and this antivirus will show your file that hidden and infected virus, if the scan process finish click
fix it for turn your file back shown again
i hope this helpful
thank you for using fixya
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