Hello,
Thank you for posting your query on Microsoft community Forums.
As per description, you are unable to access your pen drive in Windows 8. I will help you with this issue.
I would appreciate if you can provide us the following information to help us understand the issue better?
- What is the make and model of the computer?
- Which security software is installed on the computer?
- Is the issue confined to this drive?
- Have you tried accessing the pen drive on another computer?
I would suggest you to refer to the steps provided by Rajesh Govind on 23 Nov 2012 in this link:
Let us know if you need further help with any windows issue. We will be glad to help.