A warning for Windows 11 users

[fygjam]

A Windows 11 update, specifically the cumulative package KB5063878 for version 24H2, is causing some SSDs to disappear during heavy file transfers and may lead to data loss. Microsoft is investigating the issue, which appears to stem from a conflict between the update and the SSD's firmware, particularly affecting drives with Phison controllers. Users encountering the problem should avoid large file transfers, back up their data, and consider uninstalling the problematic update.
 

 

What is Happening?

• The Bug:

  The KB5063878 update, part of the August 2025 security cycle, is reportedly causing SSDs to become inaccessible during sustained, heavy write operations, such as large game installations. 

   
• Symptoms:

  Affected SSDs can disappear from Windows 11, become unallocated in Disk Management, or even show up as RAW, leading to potential data corruption. 

   
• Affected Hardware:

  The issue seems particularly prevalent in SSDs that use Phison controllers but is not exclusive to them. 

   
• Data Loss Risk:

  There is a "high likelihood of file corruption" when an SSD is affected by this glitch, making it a serious concern for users' data. 

   

What to Do if You're Affected:

1. 1. Back Up Your Data:

   Immediately back up your important files, especially if you haven't recently, to prevent data loss. 

    
2. 2. Avoid Heavy Write Operations:

   Refrain from large file transfers, game installations, or other intensive write tasks until a fix is available. 

    
3. 3. Uninstall the Update:

   As a temporary solution, you can uninstall the KB5063878 update from your system's update history. 

    

   • Go to Settings > System > Windows Update > Update history. 
      
   • Click on Uninstall updates. 
      
   • Find and uninstall the security update listed as KB5063878. 
      

What to Do to Prevent This: 

 

• Wait for a Permanent Fix:

  Microsoft has confirmed they are investigating the issue and are working with partners to resolve it. Wait for a future Windows update that includes a fix before re-installing the security patch.
• Stay Informed:

  Keep an eye on official news and tech sites for further updates from Microsoft and the component manufacturers.