Why Not able to view files in Pen drive?

when reading writing media do not switch between operating systems,eg linux/windows/mac.os each one has its own implementation algorithm for things like FAT32. This problem is very bad when using digital camera sd cards, eg take some photos, stick card in your pc to view them, see one you dont like and delete it, stick it back in the camera, and hey presto its all gone a bit pete tonge. The pc will enforce a lot more rules and may not know about the much smaller compact version of FAT32 used by the camera. this is less likely for USB sticks, but as things move forward and we keep our older USB sticks(and forget to reformat them now and then) then sooner or later its gonna get a mismatch. This can all be corrected by reformatting, but as for cameras, they like to be ones to do the formatting so the card conforms exactly to their rules. Where pc's are concerned format it in the one you use the most. Antivirus programs typically need to be very fast and may implement thier own SECTOR reading algorithm and therefore may effectively ignore what might amount to a slight difference in implementation of FAT32.In other words they may completely bypass the normal driver for the device and temporarily(whilst scanning) do their own handling. In fact they may even scan deleted files or bits of files to look for traces of viruses in unused parts of the memory. ======================================… you can try using UNDELETE programs of which there are many and these look at the data like an antivirus and effectively ignore any ruless. afterwards reformat the media.as its structure is clearly suspect.

u must check out 4 hidden files ...the files might have gone hidden ...goto control panel- select folder options-- scroll down click on unhide files.... i hope it works

Use Tools>Folder Options, and then see if you can view hidden files. If not, enable View Hidden Files.