Thank you, everyone. Before you had the chance to respond to me, and the speed of your response was greatly appreciated, I ran into another related problem. I could not eject my USB drive. So I had contacted SanDisk support and was provided with 3 options to try. I chose the easiest, (not necessarily the most convenient), I closed all open files and shut down the computer. That allowed me to remove the USB drive. After my computer was up and running again, I inserted my USB drive. There were no additional temp files.
Now I tried other USB drives I had and ran into the same ejection problem. I select the USB drive and then select EJECT from the drop-down. This does not work. Next, I selected the USB drive then selected the eject tool from the taskbar, this let me specifically select the USB drive I was using. No luck. In both cases, I was told some file(s) on the drive were still in use.
I now ask if anyone has thoughts on what is happening and how to fix it? This now seems to be a Windows problem and not a USB problem. As always, any help will be appreciated greatly.
Neinstein