Windows 11 SSD Failure Rumours: What Really Happened The Allegation After installing Windows 11 update KB5063878 (Build 26100.4946), some users—mostly in Japan—reported that their SSDs: Disappeared from File Explorer and BIOS. Showed up as “RAW” partitions. Triggered I/O...

[UK Sentinel]

The Allegation

• After installing Windows 11 update KB5063878 (Build 26100.4946), some users—mostly in Japan—reported that their SSDs:
  • Disappeared from File Explorer and BIOS.
  • Showed up as “RAW” partitions.
  • Triggered I/O errors and system crashes during large game updates like Cyberpunk 2077

 

The Theory

•  The bug only appeared under very specific conditions:
  • SSD more than 60% full.
  • Continuous write of 50GB+ (e.g., game patching).
  • Possibly triggered by certain controller firmware—but not limited to Phison

 

Microsoft’s Statement

“After thorough investigation, Microsoft has found no connection between the August 2025 Windows security update and the types of hard drive failures reported on social media”.

 

https://windowsforum.com/threads/windows-11-august-2025-patch-kb5063878-not-causing-widespread-ssd-failures.379192/

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[Grisu]

Even I had this the last days!

SSD wasnt seen by bios, so couldnt load bootloader.
I had to switch off power, afterwards I could see it in bios again and change boot partition to my SSD to start windows again.

I dont game, but SSD is quite full.

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[UK Sentinel]

Does seem like you maybe also caught by this.

Your SSD controller may be hitting a firmware deadlock during high I/O or background cleanup. Windows 11’s latest update seems to exacerbate this by:

• Changing how write queues are flushed.
• Possibly skipping certain TRIM or flush commands.
• Overloading the SSD’s internal buffer, especially if it’s already juggling wear-leveling.

All theory but the drive does disappear from BIOS, good to see you found a workaround in your case.

 

 

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[Grisu]

This time bluescreen after resume from standby, after restart no SSD visible in BIOS to boot from.
Had again to switch off power manually for a second.

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[UK Sentinel]

Not good, you should consider Windows Update being rolling back to a previous version until Microsoft release next update and see if this update is the problem  

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