Windows 11 bug traps C: drive access on some Samsung laptops, Microsoft investigating
TL;DR Summary
A bug tied to the February 2026 Windows 11 security update (KB5077181) is locking users out of the C: drive on certain Samsung laptops with the error “C:\ is not accessible – Access denied.” Microsoft says it’s investigating with Samsung and will issue a fix; affected users can roll back the update or pause installation if not yet installed. While Samsung Share app is suspected, this isn’t confirmed and workarounds should be used with caution.
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