Windows 11 Patch KB5063878 Causing SSD Issues: What You Need to Know #
A recent Windows 11 update patch (KB5063878) has triggered widespread concerns among users, as reports surface of SSD drives not being recognized, unexpected drops, and potential data loss. The issue has drawn significant attention from both the tech community and major storage manufacturers.
What Happened with KB5063878? #
After installing the August 12, 2025 patch, some users experienced problems where their SSD drives became unrecognized or were suddenly disconnected. In particular, writing more than 50GB of data could result in serious data corruption or drive failure.
Brands Reported as Affected #
The issue isn’t limited to a single manufacturer. Reports indicate it impacts drives from:
- Corsair
- Kioxia
- SanDisk
- ADATA
- Other SSD brands using Phison controllers
This has raised concerns across the storage device industry, with many users unsure if their hardware is at risk.
Phison’s Official Response #
On August 19, 2025, Phison Corporation issued a statement addressing the situation and later updated it with clarification:
- A forged internal document circulating online claimed Phison admitted responsibility. Phison has strongly denied this and is taking legal action against the spread of false information.
- The issue affects multiple storage vendors, not just Phison.
- Phison is working closely with Microsoft to identify the root cause and mitigate risks.
- The company confirmed that the August 19 statement remains its only official communication regarding this matter.
Phison emphasized its commitment to transparency and reassured partners and users that it is actively investigating.
Microsoft’s Investigation #
Microsoft has also acknowledged reports of storage issues following the update. However, according to its service alert:
- Internal tests on Windows 11 24H2 have not reproduced the problem.
- Telemetry data has shown no abnormal increase in disk failures or file corruption.
- The customer support team has not received direct complaints related to KB5063878.
Microsoft is urging affected users to report issues via the Feedback Hub or through business support channels. The company is working with storage manufacturers to replicate the problem and provide fixes if necessary.
What Users Should Do #
If you are running Windows 11 and have installed KB5063878:
- Back up your data immediately, especially if using one of the affected SSD brands.
- Monitor system stability when transferring large files (>50GB).
- If you encounter problems, submit a report to Microsoft for investigation.
At this time, no official workaround or patch has been released. Users are encouraged to stay tuned to Microsoft’s update center and official statements from SSD vendors.
Final Thoughts #
The Windows 11 KB5063878 patch issue highlights the risks that even security updates can pose to system stability. With both Microsoft and Phison actively investigating, users should take precautions to protect data until more clarity is provided.
Stay updated on this story as new developments emerge.