To scan a flash drive, or external hard drive:
1) Plug the device into your computer.
2) Open PC Matic and click on the "Options" button.
3) Under Scan Options > Drives to Scan, place a check in the boxes for only the drives that you want scanned.
4) Click the green "Save" button and close out of the Options menu.
You can now run a scan and only the checked drives will be scanned.