The Windows 11 update KB5063878, released on August 12, 2025, has drawn widespread attention after multiple users reported severe problems. These issues include SSDs not being recognized, random drive drops, and even data loss. The situation has raised concerns among both end users and storage manufacturers.
What’s Wrong with KB5063878? #
After installing the August 12 security patch, some users found their SSDs were no longer detected by the system. Others reported drive disconnections during transfers, especially when writing more than 50GB of data, which in some cases led to corrupted or lost files.
Affected Brands #
Reports suggest that several popular SSD brands are at risk, including:
- Corsair
- Kioxia
- SanDisk
- ADATA
- And other SSDs using Phison controllers
This has left many users worried about whether their drives are vulnerable.
Phison’s Official Response #
On August 19, 2025, Phison released an official statement, later followed by an update the same afternoon:
- A so-called “internal Phison document” circulating online is a forged file. The claim that the issue is solely linked to Phison was denied, and the company stated it will pursue legal action.
- The issue is not limited to Phison-based SSDs but affects devices from multiple storage vendors.
- Phison is working closely with Microsoft to investigate the root cause and develop a solution.
- The August 19 statement remains Phison’s only official communication on the matter. The company thanked its partners and industry peers for supporting transparency and open communication.
Phison emphasized its commitment to transparency and promised to keep users and industry stakeholders updated with further developments.
Microsoft’s Investigation #
Microsoft confirmed that it has received related reports and issued a service update with these points:
- Testing on Windows 11 24H2 has so far not reproduced the issue.
- Telemetry data does not indicate a higher rate of drive failures or file corruption.
- The customer support team has not logged formal complaints linked to KB5063878.
Microsoft encouraged affected users to report details via the Feedback Hub or enterprise support channels to assist in the investigation.
What Should Users Do? #
If you’ve already installed KB5063878 on Windows 11:
- Immediately back up critical data, especially if using SSDs from affected brands.
- Be cautious during large file transfers (50GB+) and monitor system stability.
- If you encounter issues, submit a report to Microsoft for further investigation.
As of now, there is no official hotfix available. Users should watch for updates from Microsoft Update Center and SSD vendors for new announcements.
FAQ: Windows 11 KB5063878 SSD Issues #
Q1: How can I tell if my SSD is affected?
A: Check if your SSD is one of the reported brands (Corsair, Kioxia, SanDisk, ADATA, or Phison-based). Monitor your system during large file transfers, and look for recognition errors or drive disconnections.
Q2: Should I uninstall KB5063878?
A: Uninstallation may temporarily restore stability but could remove critical security updates. Always back up data first and consult Microsoft guidance before uninstalling.
Q3: Is my data safe if the SSD disconnects?
A: Large file transfers may risk data corruption. Regular backups are strongly recommended until Microsoft releases a fix.
Q4: When will Microsoft release a fix?
A: There’s no official timeline yet. Users should monitor Microsoft Update Center and follow vendor announcements for updates.
Q5: Can other SSDs not on the affected list still be impacted?
A: While most reports are linked to specific brands, the issue may potentially affect other SSDs under similar configurations. Monitoring and backups are advisable for all users.
Conclusion #
The Windows 11 KB5063878 update issue highlights that even security patches can introduce unexpected risks. While Microsoft and Phison continue their investigation, users should ensure regular data backups and remain vigilant during large transfers.
Staying informed and following official guidance is the best way to minimize potential impact until a permanent solution is released.