Microsoft Uncertainty on Windows 11 KB5063878 Impacting SSD Failures Amid User Reports

Many users of Windows 11 are experiencing storage issues, particularly with SSDs and HDDs, following the installation of update KB5063878. However, both Microsoft and Phison are unable to replicate these issues during their testing.
While no confirmed failures have been detected in their telemetry or internal evaluations, Microsoft is actively gathering feedback from affected users and advises caution.

Recently, a wave of reports surfaced from Windows 11 users experiencing critical failures and data corruption in both Solid-State Drives (SSDs) and Hard Disk Drives (HDDs) after applying the 24H2 security update KB5063878 (build 26100.4946).Despite these claims, Microsoft and Phison maintain they have not been able to reproduce the reported problems in controlled tests.

Microsoft’s Assessment of the Situation

Following the release of the August 2025 Security Update (KB5063878), users began to report issues where SSDs and HDDs would become unresponsive under sustained write loads of around 50GB or more. In response, Microsoft communicated with various media sources to clarify that they have not experienced similar issues in internal tests or telemetry data. Furthermore, Microsoft’s customer support has not recorded related reports from users.

Microsoft is actively seeking user feedback to better understand the root cause of these issues and promises to update the community once more information is available. Despite this, the Windows Release Health page highlights at least two known concerns with the update. These include significant performance issues such as stuttering and lag in streaming applications like OBS and NDI Tools, as well as Error 0x80240069 during installation via the Windows Server Updates Service, which has since been resolved.

Phison’s Findings on Drive Failures

Phison, the manufacturer involved, also issued a statement regarding the incidents. Their extensive testing, totaling more than 4, 500 hours with over 2, 200 test cycles, did not replicate any failures. Phison emphasized that they have not received complaints from either partners or end-users about the update affecting their drives.

Additionally, Phison posited that misinformation might be exacerbating the situation, indicating that some circulating reports may be based on incorrect information. Media outlets linking Phison drives to the failures seem to have relied on dubious or unverified testing methodologies, contributing to the current confusion.

User Experiences and Ongoing Concerns

Despite the assurances from Microsoft and Phison, user reports of storage complications persist. It remains uncertain whether these issues are definitively linked to the KB5063878 update or if the failures are coincidental, unrelated to this specific patch.

I recently released a video tutorial detailing how to uninstall the problematic KB5063878 update, which has prompted many users to voice their frustrations regarding the recent changes.

https://www.youtube.com/watch?v=

For instance, some users reported problems where external drives became inaccessible but were restored after uninstalling the update and rebooting their systems. Conversely, others experienced irrevocable data loss during this process.

Interestingly, there are also users whose drives reportedly experienced no issues whatsoever after the update, highlighting a varied and unpredictable aftermath associated with KB5063878.

For broader community insights, many discussions on Reddit reveal a blend of experiences, including accounts of issues linked to specific system configurations.

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Moreover, a community member on Reddit reported that their device became inoperable post-installation of the problematic update, which adds to the growing list of concerns among users.

Recommended Actions for Users Affected by KB5063878

At this juncture, the most prudent approach for users is to temporarily halt or disable automatic updates until Microsoft clarifies the situation. If you have already installed the update, consider uninstalling it and suspending Windows Update to prevent further complications. If you opt to retain the update, exercise caution by avoiding large file transfers and refraining from filling drives to capacity.

Regardless of the chosen course, ensure you have a robust recovery plan in place, which includes a complete backup of your essential files and system.

Your Experiences Matter! Feel free to share any additional insights or personal stories in the comments section below.

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