I recently discovered a stubborn virus on my computer, which prompted me to do a clean install of Windows 10 using a USB stick I purchased. Unfortunately, I think the virus transferred to the USB when I connected it to the infected machine. Now, I want to perform another clean install using a different, non-infected computer, but I'm unsure if simply formatting the USB drive will eliminate the virus. What steps should I take to ensure my USB is virus-free before installing Windows again?
4 Answers
Check where you got the USB drive from. Sometimes, if it’s a cheap knock-off, the virus could potentially be embedded in the drive's firmware.
If you're worried about the USB being infected, the simplest option is just to throw it away since they’re cheap. Grab a new USB drive and connect it to a computer that you know is clean. Flash Windows onto that drive, then make sure to boot from it when installing on the infected PC. Delete all partitions during the install to ensure anything malicious is erased.
I recommend reformatting the USB stick first. If you want a thorough clean, use a secure erase utility to wipe it completely. This will reset all memory cells and remove any hidden malware. Many BIOS setups have a secure erase option built in as well.
Just reformatting should typically be enough, especially if you create the installation from a clean computer. But if you're concerned, using a formatter utility from sdcard.org could also do the trick.
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