CIRCUITPY Drive Does Not Appear or
Disappears Quickly
Kaspersky anti-virus can block the appearance of the CIRCUITPY drive. There has not
yet been settings change discovered that prevents this. Complete uninstallation of
Kaspersky fixes the problem.
Norton anti-virus can interfere with CIRCUITPY. A user has reported this problem on
Windows 7. The user turned off both Smart Firewall and Auto Protect, and CIRCUITPY
then appeared.
Sophos Endpoint security software can cause CIRCUITPY to disappear() and the
BOOT drive to reappear. It is not clear what causes this behavior.
Device Errors or Problems on Windows
Windows can become confused about USB device installations. This is particularly
true of Windows 7 and 8.1. It is recommended() that you upgrade to Windows 10 if
possible; an upgrade is probably still free for you: see this link().
If not, try cleaning up your USB devices. Use Uwe Sieber's Device Cleanup Tool()(on
that page, scroll down to "Device Cleanup Tool"). Download and unzip the tool.
Unplug all the boards and other USB devices you want to clean up. Run the tool as
Administrator. You will see a listing like this, probably with many more devices. It is
listing all the USB devices that are not currently attached.
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