John,
These devices have been in use for several years and the message has never come up before.
There are 4 devices, all of which I believe are USB 2.0
2- PNY 8GB ''Attach'e" (One has trouble reading, so it is not used)
1- 8GB PNY (Model unknown, but it closes with a slider rather than having a cap)
1- 160GB Western Digital "MY Passport Essential"
In looking back, I believe it was the "Attach'e", but it could have been the Passport. That is not important as long as I know there is no malware problem.
I keep the PNY slider model in the computer all the time and backup my personal file changes weekly to all 3 and keep them in separate areas of the house. If I have a fire or other disaster, I lesson the chances of losing all my data. I know that I can back up online, but I have trust issues with online backup and prefer not to do it. You can always reload software, or buy a new computer, but you can never recover your personal data. I also try to do a system backup with Windows Backup about once a month.
In looking at the AutoPlay options, I do see the "Enhanced Storage Device" option in which I have checked "Take no action". At least I now know that I can create a password for the devices in the future.
Thanks for the help. I should be all set.