Hi I would like to know how can one differentiate between 2 exact flash disk drives when using HDD raw copy. I am just terrified I make an image of the blank drive over the one with all the data on.

If using windows try looking in disk management. Plug one flash drive in & it will tell you what it is ie disk1 etc then plug second one in & check again ie disk2

loki

You can make an image of the first flash disk containg data
to a file onto your hard disk, then plug the blank one and write
from the image file.