Windows Defender & scanning USBs/external drives.

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Hello all, I’ve moved from Norton to test out WD & would like to know whether Defender automatically scans USB devices upon connecting or will auto scan the files upon accessing/opening?

Thanks,
 
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Bastet. I'm not sure if Defender scans connected USB drives. I right click on the USB drive and select Scan with Windows Defender.
 
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Tbh Norton I don’t think it does either, I was hoping that WD would scan the files as I access them instead.
 
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I created a text file with the Eicar string on a USB & just as I’d saved the file Windows defender notified me of a virus, I clicked OK & then tried to open the file where Defender cleaned the ‘virus’. Tested also on a SD card with same results.
 
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