Large Write Operations Trigger the Issue, Cause Still Unclear Between Windows Update and Controller Hardware.
If You’ve Already Updated, Removing the Patch Is Strongly Recommended.
https://x.com/Necoru_cat/status/1956949132066898080
Over the past couple of weeks, users have been running into a pretty nasty problem tied to the Windows 11 24H2 update, specifically the patch labeled KB5063878. After applying it, certain SSDs, especially those built with Phison controllers, have started failing in a way that feels like sudden death. People describe the drives simply vanishing from Windows during big transfers, sometimes reappearing after a reboot, sometimes staying gone for good.
This is not just one-off chatter. The reports first popped up on Japanese tech communities when a gamer noticed their SSD disappeared mid-way through a large game update. Since then, more cases have shown up across Reddit and hardware forums. The pattern is consistent: during heavy sequential writes, like transferring more than 50GB or pushing the drive beyond 60% capacity, the SSD suddenly drops offline. A reboot might bring it back temporarily, but in some cases, it never recovers. That’s why folks are calling it “SSD sudden death.”
The list of affected products isn’t fully mapped yet, but names keep coming up: Corsair Force MP600, Kioxia Exceria Plus G4, SanDisk Extreme Pro M.2 NVMe, even certain WD drives. The common denominator is the Phison controller, and more specifically DRAM-less models, though not exclusively.
Phison itself has acknowledged the situation and says they are investigating with manufacturers. Microsoft has yet to give an official statement. Right now it isn’t clear whether the blame falls on the Windows update, the controller firmware, or some bad interaction between the two. That uncertainty is frustrating, because users don’t know if they should expect a Windows patch, a firmware update, or both.
So what can you actually do? If you haven’t installed KB5063878 yet, the safest move is simply to wait. Hold off until there’s either confirmation of a fix or at least an official explanation. If you already updated, back up your data immediately and try to avoid big write operations—don’t push 50GB game patches or huge video transfers until more is known.
There’s also a more concrete workaround: you can roll the update back. Go to the Start menu, open Settings, then head into Windows Update → Update history → Uninstall updates. From there, look for KB5063878, select it, uninstall, and restart your computer when prompted. Many users report that once the update is removed, the drive stops dropping out. It’s not elegant, but it may save your SSD until a proper fix arrives.
At this point the safest advice is simple: don’t gamble with your data. Make backups, avoid stressing your drive if you’re already on the update, and if possible, just remove the patch altogether. Whether it turns out to be a Windows issue or a flaw in the controller, nobody wants to lose a drive full of files while waiting for Microsoft and Phison to sort things out.
