If the drive is not working on the machine you used it last on or any machine you format it and then put your files on it again.
Often these events is where folk learn that these devices, while neat and handy are not totally reliable. All it takes is for us to yank the drive out or lose power at the wrong moment and this will happen.
I plugged my flash drive (which has data) into my laptop computer and I got this message:
you need to format the disk in drive F: before you can use it. Do you want to format it?
Tried it several times but getting same response. Plugged it in my desktop computer but getting same response. How can I solve this problem? This is the first time this has happened.