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My computer that's running Windows 7 detects all flash drive file systems as RAW, and thus shows an error message to format them as soon as they're plugged in.

I tested all the flash drives in other computers and have no problem and their file system is FAT32.

How can I fix this issue?

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  • Hope you've tested all USB front and back ports? Suggestion: Disconnect all non-input USB devices, then in Device Manager try deleting all USB root hubs and controllers (best to do it with a PS/2 keyboard or via Remote Desktop, because your USB mouse and KB will stop working). Reboot and Windows will reinstall them. See if that helps. Also run sfc /scannow from an admin command prompt. If this is a hardware issue though you'll need to get a new motherboard or perhaps an add-on PCI-E card that supplies USB ports.
    – Karan
    May 12, 2015 at 4:20

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