Microsoft deletes deleterious file deletion bug from Windows 10 October 2018 Update

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Cable also identified another file deletion scenario involving redirection of Known Folders to OneDrive storage whereby contents of the original default directory were erased if they weren't moved.

Last week, Microsoft began rolling out the October 2018 Update to Windows 10, bringing a whole slew of new features and app upgrades. This caused a new issue, though - users with KFR previously enabled found that files still in their default location were deleted, the idea being that only the new "active" redirected folders would remain.

"We have paused the rollout of the Windows 10 October 2018 Update (version 1809) for all users as we investigate isolated reports of users missing some files after updating", Microsoft writes.

Prior to re-releasing the October 2018 Update our engineering investigation determined that a very small number of users lost files during the October 2018 Update.

John Cable, Director of Program Management, Windows Servicing and Delivery penned a long blog post to explain what went wrong during testing. So, to solve the problem, Microsoft introduced code that would delete those old, empty folders.

In a blog post, Microsoft said the affected population was low - "one one-hundredth of one percent" of people who installed the update experienced data loss, the company claims. The root cause of this issue, as it turns out, is the "Known Folder Redirection" feature that when enabled, moved files from folders such as Documents, Pictures, Desktop, Camera Roll, Screenshots Videos a new folder, but was deleted from either folders due to some changes made to the logic from the feedback received from Insiders.

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Furthermore, an early buggy version of the OneDrive client with autosave turned on didn't move files in users Documents and Pictures folders from the old location to the new one.

"If you have a Microsoft store in your neighbourhood you can visit it for a fix as well; perhaps you will be their first actual customer!"

Microsoft support technicians "have the tools to get you back to a good state", Windows Insider Program lead Dona Sarkar tweets. You keep can saving files into the usual Downloads folder, for instance, and it's actually saved on another drive with free space, in other words. Consequently, Microsoft plans to add a new feature to the Windows Insider Feedback Hub that will let users grade the "impact and severity" of a software flaw, Cable explained.

Microsoft has also changed the workaround text on its website.

#WindowsInsiders If you've run into the "missing files after update" issue for 1809/October 2018 Fall update, please call our support line.