- KB5063878 (and to a lesser extent KB5062660) would cause SSD failures under intensive writes.
- The reports primarily target Phison controllers and several models from popular brands.
- You can check the model and controller from Device Manager or with utilities like HWiNFO/CrystalDiskInfo.
- While a fix is pending, it's a good idea to avoid large writes, make backups, and consider uninstalling patches.
The latest community complaints point out that the update of Windows 11 KB5063878 (24H2, build 26100.4946) would be causing critical failures in SSDs during sustained write tasks, causing the drive to become unrecognized by the system and, in some cases, inaccessible after a reboot.
According to early reports, the problem appears with large transfers (around 50 GB) and mainly affects drives with Phison controllersMicrosoft has not yet posted a notice on its health dashboard, but sources consulted indicate that investigates the failure and Phison has confirmed that it is collaborating with the company after denying a previous alleged statement that turned out to be false.
What is known about the SSD bug in Windows 11?
The cases described share a pattern: during a intensive and sustained writing (for example, copying game folders, moving very large files, or creating large compressed files), the drive may disappear from Explorer and become inoperative until restarted, with the risk of data corruption if the interruption occurs in the middle of the operation.
An approximate threshold of 50 GB written in one go and more likely scenarios when the disk is very full. Some users report heavy loads when controller usage exceeds a certain level, which points to a disk issue. management under stress.
In addition to KB5063878, some have observed similar behavior after installing KB5062660, although the volume of reports is significantly lower and the correlation is not as clear. As a precaution, many affected people have opted to pause Windows Update.
The case study is not homogeneous: there are teams that recover unity with a simple reboot, and others where the partition becomes corrupted and requires deeper intervention. This suggests a complex interaction between system, firmware and driver.
In technical circles, hypotheses such as a cache problem or a memory management which would trigger the blockade under massive charges, but in the absence of an official note, the sensible thing to do is to avoid ensuring a single cause.
Devices and controllers mentioned by users
Community reports point to the common denominator of Phison controllers in multiple models, with a higher incidence in units without DRAM. However, specific cases have also been reported in controllers other manufacturers, which does not rule out a broader scope.
Amongst the affected models that have been mentioned in forums and networks include, among others:
- Corsair MP600 y MP510 (NVMe)
- SanDisk Extreme Pro (NVMe series)
- Kioxia Exceria Plus G4 (NVMe)
- XPG SX8200 Pro, ADATA Legend 800, Crucial P3 Plus
- Some units WD Blue/Red y SK hynix P41, HP FX7000, Hanye HE70
- Controllers cited: Phison PS5012-E12 (and variants), in addition to InnoGrit y Maxio in isolated cases
Lists have also been shared in which the fault has not been reproduced during community testing, with units such as Samsung 990 Pro, 980 Pro, 870 EVO, Seagate FireCuda 530, Crucial T700 o Solidigm P44 Pro. It is advisable to take them as a guideline: the absence of incidents in a specific model no guarantee that cannot be affected in other environments.
All of this fits with the idea that the problem could depend on a combination of Windows version, firmware, drivers, and usage pattern, rather than a single component.
How to check if your SSD may be affected
If you want to assess the risk in your team, the first thing is to identify the exact model of the SSD and Controller that you use. There are several quick ways to do this from Windows or with free utilities.
Recommended options To identify your unit and its controller:
- Opens Device administrator > Disk drives and note the model shown.
- See manufacturer's website of your SSD: the specifications usually indicate the controller (e.g., Phison).
- Use utilities like CrystalDiskInfo o HWiNFO64 to see hardware and firmware details.
- Some manufacturers (Samsung, Crucial, Kingston, Corsair) offer their own with with device information.
If your unit uses a Phison controller, take extra precautions until a confirmed patch is available. If it's from another vendor, the risk seems lower based on reports, but there are no absolute guarantees.
In all cases, maintain a Backup recent backup of your critical files is the best safety net against any contingency.
Recommended measures while the patch arrives
If you already installed Windows 11 24H2 and, in particular, the update KB5063878 (or the preliminary KB5062660), it is advisable to be extremely cautious so as not to force the scenario that triggers the failure.
- Avoid mass writes: Don't copy games or files that add up to several tens of GB at once; do it in small batches.
- Free up space If the SSD is very full, the more headroom it has, the lower the probability of crashing under stress.
- Use a secondary drive or the cloud for backups and large transfers in the meantime.
- Rate uninstall KB5063878/KB5062660 if you are experiencing the problem and need immediate stability.
If the drive has disappeared after a sustained write, try restart the pcIn many cases, detection returns to normal, although if there is partition corruption, you may need recovery tools or to reassign the volume.
At the institutional level, Phison has communicated that it is working with Microsoft to clarify the scope and solution, and has clarified that a document released in its name was counterfeit. From the Redmond side, the company indicates that it is aware of the reports and analyzing the problem to issue a fix.
Until there is a corrective update, the best strategy is minimize write loads, frequently check official channels and keep backups up to date.
The current outlook suggests a problem associated with large-volume writings Following the latest Windows 11 patches, with a higher incidence on Phison controllers and isolated cases on other platforms; while manufacturers and Microsoft investigate, the combination of caution in transfers, backups and, if necessary, temporarily removing conflicting updates, is the most sensible way to avoid surprises.