I have just purchased a Sandisc Ultra USB and backed up my PC.
When I put the USB into my PC and I open the photos folder it does not show the thumbnails, only the icons. I would like to be able to view and browse the thumbnails through my PC to choose what to transfer and view.
Previously I used a Integral Courier USB which allowed me to do this. I chose the Sandisc as it is password proteceted.
Don’t know about other USB drives but your SanDisk problem only applies to the use of SecureAccess for your pictures. If you save the pictures to the USB drive directly, outside the SecureAccess app, you will be able to see their thumbnails.  Â
After much frustration and endless searches, I finally found the solution! So simple, but it worked. Insert your jump drive. If you have anything on it already, remove them, or you’ll probably lose them. The drive has Disk Utility on it (check the menu if you can’t find it.. I can’t remember where it was on my SanDisk). Click on “Erase”.
The next time I loaded up my photo folders on this now erased drive, they all were thumbnail images instead of generic icons! .. Evidently, the drives come with “security”, which renders many of your photo thumbnails as generic icons. I don’t need the security.. just need to be able to see the photos!