Major Windows 11 24H2 Update May Be Affecting Your SSD

A critical Windows 11 update released in August 2025—identified as KB5063878—has raised serious concerns. Users have reported SSDs disappearing during heavy file operations (like installing large games or backups), threatening critical data integrity. If you’re a power user with high-capacity writes, here’s what you need to know to stay safe.

What’s Going On?

• Disappearing SSDs & Data Loss
  The bug reportedly causes SSDs to vanish from both File Explorer and even the BIOS during large write operations—especially when drives are over 60% full or handling roughly 50 GB+ of continuous data. Some users have experienced unrecoverable data loss.Tom’s Hardware+10TechRadar+10It’s FOSS News+10It’s FOSS NewsWindows Latest

• Affected Hardware
  While initial reports pointed to Phison-based SSDs (especially DRAM-less models), later incidents involved other brands too—suggesting a broader vulnerability. Affected drives include those from Corsair, WD, SK Hynix, ADATA, and others.Blizzard Forums+4PC Gamer+4Reddit+4

• Microsoft & Phison Respond
  Microsoft is aware of the issue and is investigating with hardware partners It’s FOSS News+11TechRadar+11Tom’s Hardware+11. Meanwhile, Phison has confirmed involvement in the investigation and is collaborating with stakeholders PC GamerTom’s Hardware.

Real-World User Reports

On Reddit and forums, users describe SSDs becoming inaccessible mid-operation—some recoverable after a restart, others irreversibly corrupted. One user shared a test simulating game patch loads:

“Further analysis suggests SSDs with Phison controllers—especially DRAM-less models—fail at lower write volumes.” PCWorld+10Reddit+10PC Gamer+10

Another posted in Blizzard’s Overwatch forums:

“Prolonged writing of 50 GB or more can corrupt your SSD. It’s confirmed across multiple brands.” Blizzard Forums

What You Can Do Right Now

To protect your system and data:

1. Avoid Large File Writes Temporarily
   Pause heavy operations like game installs or backups if you’re on Windows 11 with KB5063878 installed.PCWorld+2TechRadar+2Reddit+3TechRadar+3PCWorld+3Reddit+10IT Pro+10Tom’s Hardware+10

2. Back Up Important Data — Now
   Use the 3‑2‑1 rule: 3 copies, 2 media types, 1 off-site backup. It only takes one SSD failure to lose everything.

3. Monitor Drive Health & Firmware
   Use SMART tools like CrystalDiskInfo and check for firmware updates—especially for SSDs using DRAM-less or Phison controllers.Windows Central

4. Consider Uninstalling the Update
   If you’re affected, revert KB5063878 via Settings → Windows Update → Update History → Uninstall Updates.

5. Be Patient—Fixes Are Likely Coming
   Microsoft and Phison are working on solutions. Keep an eye on updates and consider delaying installs until the issue is resolved.