This situation is very common and is caused by the insertion of these media on desktops and netbooks contaminated by viruses, that to mask your files copied to your device, modify the attributes of those who are in these media, causing to not display properly from that moment. To fix it manually, follow these steps: if they have apparently disappeared documents and files from your flash memory, and thou shalt not deleted manually verifies that still kept inside, checking the occupied space, which you can do by going to my computer and in the corresponding unit selects their properties. Access the folder options tool, you can find it in the control Panel, on the view tab mark the checkbox show files and folders hidden units. In the same window bottom uncheck the box Hide protected files from the system, press OK to close the window. Now open in Windows Explorer the drive of your memory and you’ll see files although somewhat fade, the next step is to restore its attributes original. For that on the window of your memory flash by pressing and holding the Shift key gives a right-click with the mouse and selects the menu open command here window, the black CMD console window, opens now writes to it the following command and press Enter. ATTRIB – R – S H this returned the original attributes to files in memory for what you can use them, keep them there, or copy them to another location. Now only remains to return to hide hidden files and system and thus returned to its default state, so get the reverse that you efectuaste in step 1 and 2.
The previous method you can use in any kind of USB device. If you can’t have your objective to carry out the above operation in easiest way you can do it online by accessing the following website where provided that free service, just select the drive letter assigned to your device and pressing a button, the only requirement is that it only works with the Internet Explorer browser. Retrieve and view online hidden files in flash memory. In cases in which it is impossible to access folder options indicates that the changes made by the virus has been more extensive, a workaround enter in any of the following pages where explains how to restore the affected keys from the registry, manually and automatically. Restore folder options online, and view hidden files and folders view hidden files in Windows online and restore registry keys. Original author and source of the article.