1-877-523-3678, How do I scan a flash drive for viruses using avast?Software Technical SupportUpdated on Apr 13, 2016 View more like this | Visit SAN FRANCISCO, CA | Contact Antivirus tech support |

Good question. Every time you plug an unknown flash drive into your computer, you’re taking a risk because a USB drive can spread malware as well as attract it. Have you ever heard “My flashdrive ate my homework” as an excuse? It could happen. Here's how avast! can help.
Avast! security products come with a number of pre-defined scans installed including the ability to scan any removable storage device that is connected to your computer, such as USB flash drives, external hard drives, etc. It will scan the drive to detect potential "auto-run" programs that may try to launch when the device is connected.
To carry out a manual scan of Removable media, select the Scan tab in the avast! user display. This will open the Scan screen as shown in the screenshot.
Reference by :- https://blog.avast.com/2012/09/27/how-do-i-scan-a-flash-drive-for-viruses-using-avast/
Avast! security products come with a number of pre-defined scans installed including the ability to scan any removable storage device that is connected to your computer, such as USB flash drives, external hard drives, etc. It will scan the drive to detect potential "auto-run" programs that may try to launch when the device is connected.
To carry out a manual scan of Removable media, select the Scan tab in the avast! user display. This will open the Scan screen as shown in the screenshot.
Reference by :- https://blog.avast.com/2012/09/27/how-do-i-scan-a-flash-drive-for-viruses-using-avast/