system
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Virtually all the computers I access at work or at home have some kind of antivirus, and most have comprehensive malware protection.
That is not guaranteed for EVERY computer I might need to use my primary or secondary USB thumbdrives on. (Especially if that computer is owned by a naive user, or a public workstation such as one at the library!)
So, I really need a lightweight but GOOD virus scanner that I can run portably (i.e. “green”) from my USB stick. Avast U3 edition was and still is the best I’ve found.
I’d like to continue using an Avast product. The only other USB-specific products I’m aware of is McAfee (bloated, slow, and overpriced), TrustPort (short history and little information about them), and the previously recommended McShield (even less info).