Posted 08 February 2017 - 09:55 AM
This is extremely unlikely to be the work of any kind of malware, so I'm not surprised that a malware scan turned up nothing.
It sounds like a hardware issue to me. Try this:
Let's call your external USB ports 1, 2 and 3.
Let's call your external drives A, B and C.
Let's also say that drive A is connect to USB port 1, drive B to USB 2, and drive C to USB 3.
Using "Safely remove hardware", 'disconnect' all three drives and then unplug them.
Now plug drive A into USB port 1 again. Give it a few seconds to recognise the drive. Note whether you get "This device can perform faster" or not.
If you don't, then plug drive B into USB port 2 and give it a few seconds again.
If you still don't receive the message, then repeat with drive C using USB port 3.
If you STILL don't get the error, then it was probably nothing more than a loose connection. It may or may not happen again at some point in the future: if it does, then it could be an internal connection in either your computer itself or the disk drive enclosure.
Use "Safely remove hardware" to 'disconnect' all the drives again as before and then unplug them.
I'm going to assume you got the message when you plugged drive B into USB 2, but the principle here will apply regardless of where/when it happened.
Plug drive B into a different USB port. Let's say you use 1. Do you receive the message?
If so, then there could be a fault on the drive, or a loose connection in it somewhere.
If not, then connect a different drive (let's say C) to USB 2. Do you receive the message?
If so, then there's a fault with USB port 2.
Hopefully that's clear - it's a process of elimination to try and find where there could be a fault!
Helping a loved one through a mental health issue? Remember ALGEE...
Assess the risk | Listen nonjudgementally | Give reassurance and info | Encourage professional help | Encourage self-help and support network