I just had the same problem with my PNY 16 GB Attache (CE-FC) flash drive.
When I put it into my computer, instead of opening, it offered to "format" the drive.
Since I already have about 10 GBS of Files, Data, and Programs on it, I didn't want to do that.
Trying the drive in another computer that has read the drive before, got the same problem, but don't know why?
Is there any software that can "Fix" the drive, or at least allow me to Save the data to another drive?
Any other Help Assistance or Advise?