Cannot view all the files of pendrive

Hello,
when I plugged in my Pen drive , It is opened but I can not open and see all files it contains inside it. There is no hidden file on my pen drive. Infact, I have also tried the terminal command that shows hidden file but it didn't work. Terminal command which I have tried is: defaults write com.apple.Finder AppleShowAllfiles YES http://static.ccm2.net/ccm.net/pictures/1p3y4zE6unGzFzBf0HflSTpUalNntCiAhm7fkLWsItfdEMsOb78g7QdugcDDVmC3-screen-shot-2017-08-12-at-12-28-56-am.png
I think problem is something else. I am not so much familiar with Mac os x.
Would be a wonderful help if you respond me very soon.