Uninstall KB5063878 to Resolve SSD Disappearing Problem on Windows 11

Critical Storage Issue with Windows 11 24H2 Update

The Windows 11 24H2 update KB5063878 (build 26100.4946) may lead to the unexpected disappearance of SSDs and HDDs during sustained write operations exceeding approximately 50GB, particularly when the drive is more than 60 percent full. This situation poses a significant risk of data loss and permanent hardware failure.
Both Microsoft and Phison are currently investigating these critical issues. Users are strongly advised to delay the update, back up all important data, and uninstall it if it has already been applied.

On August 12, 2025, the rollout of the Windows 11 24H2 security update KB5063878 (build 26100.4946) sparked immediate concerns of a severe storage malfunction, most notably impacting users in Japan. The primary issue observed revolves around Solid State Drives (SSDs) becoming unresponsive under sustained write conditions, notably past the 50GB threshold, especially when the storage is nearing capacity.

According to independent tests, nearly 57% of the tested SSDs failed, including a WD SA510 2 TB drive that was rendered unrecoverable following a reboot. While numerous drives may reconnect after a system restart, higher-risk incidents classified as “NG Level 2” can lead to potential data corruption or complete disk failure.

This problematic behavior is not isolated to a single brand; it affects a diverse range of SSD models, extending beyond those with Phison NAND controllers. Alarmingly, the issue also impacts traditional Hard Disk Drives (HDDs).

Microsoft and Phison are actively addressing the situation, collaborating with hardware partners to investigate the reports. However, as of now, Microsoft has not officially recognized this issue on the Windows Release Health page. A spokesperson stated, “We’re aware of these reports and are investigating with our partners.”

During this uncertain period, users are urged to refrain from large file transfers and to delay applying KB5063878 until the problem is resolved. Securing critical data through robust backup strategies is equally essential. If the update has already been installed, it is advisable to uninstall it immediately, as persistent issues may already have occurred.

Guide to Uninstall Update KB5063878 from Windows 11 24H2

If you need to uninstall the KB5063878 update to safeguard your storage devices, follow these step-by-step instructions:

Open Settings on Windows 11.
Select System.
Navigate to the Optional Features page.
Click on “More Windows features” within the “Related settings” section.
Select the Windows Sandbox option (if applicable).

Quick note: Disabling Windows Sandbox may help avoid the error 0x800F0825 during the uninstallation of the KB5063878 update.

Click OK.
Restart your computer.
Open Settings again post-reboot.
Go to Windows Update.
Access the Update History page.
Select the Uninstall Updates setting from the “Related settings” section.
Click Uninstall to remove the KB5063878 update.
Restart your computer.
Reopen Settings.
Go to Windows Update.
Use the “Pause for 1 week” option to disable automatic updates and avoid reinstalling the problematic update.
(Optional) Reopen Settings.
Select Optional Features.
Click on “More Windows features” settings in the “Related settings” section.
Re-enable the Windows Sandbox option (if applicable).
Click OK.
Restart your machine once again.

Completing these steps will successfully uninstall the troublesome update, thereby preventing further issues with your storage devices.

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Once the underlying issue has been resolved, it’s vital to resume regular system updates to continue receiving crucial security patches and driver updates.

What to Do If Your Storage Has Disappeared

If you have already experienced this storage issue due to the installation of KB5063878, attempt to uninstall the update using the previously mentioned steps. Should you face data loss, recovery efforts may hinge on the availability of data backups, as a permanent fix does not guarantee data restoration.

Importance of Backups

This unforeseen issue serves as a potent reminder of the necessity for regular data backups. Regardless of whether your hardware is impacted, maintaining comprehensive backups is critical.

There are various strategies for safeguarding your data. You can utilize the legacy System Image Backup tool for a complete system clone, leverage Windows 11’s automatic backups, or utilize File History, Windows Backup, and OneDrive for file-specific backups.

To prevent similar future scenarios, consider disabling automatic updates on Windows 11 and manually scheduling updates to occur roughly two weeks after the release of a cumulative update, provided no issues arise.

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