Error Message: I/O Read error The flash drive I am using to move files decided to give me this i/o read error on all or most of my corel files. My back up files too. I've done a recovery but files still don't open. Any suggestions?

Error Message: I/O Read error
The flash drive I am using to move files decided to give me this i/o read error on all or most of my corel files. My back up files too. I've done a recovery but files still don't open.  Any suggestions?