Hi, hope someone can help...any advice, tips, info appreciated...

*Had moved images from Samsung Galaxy J5 phone to Samsung Duo USB Flash Drive.
*The Samsung Duo USB Flash Drive was still mounted in phone when phone battery finished.
*So had to pull out the USB Flash Drive from phone without unmounting it ('cos phone is off so can't access the 'unmount' option) in order to insert charger to charge the phone.

*Now in the Samsung Duo USB Flash Drive can't find any of the moved images or the folder which had been created to move them into in which the moved images should be ... very worried ...

How can I get back those lost images? How can I recover those lost images? Please can anyone help...?

Are there any free apps, free software that can recover them?

Thanks in advance...