28,658 questions
Firstly, make sure the switch is not set to "Lock" or "Read-Only" position.
==========
Right-click on the USB drive and select Properties.
Go to the General tab.
Uncheck the "Read-Only" attribute box if it's selected.
Click "Apply" and "OK".
==========
Create a new user account and check.
==============
If required back up the drive and then format.