If you install an antivirus on one HDD/SSD, does it protect other HDDs/SSDs too?

Green Socks

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Nov 1, 2015
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I know that you can scan all drives with an antivirus but what about real time protection? If I install, say, Avast antivirus and Malwarebytes on my SSD will it also protect my HDD and any other drives I decide to add? I'm guessing yes but I just want to be sure!