Microsoft rolled out the security update for Windows 11 version 24H2, labeled KB5063878, on August 12, 2025. This update notably addressed sign-in delays on newly configured Windows 11 devices due to specific preinstalled packages. However, it also introduced a couple of problems.
Some individuals encountered an installation issue indicated by the code Ox80240069 while updating via Windows Server Update Services (WSUS), according to Microsoft’s reports. Fortunately, this problem has been addressed and users should not experience it anymore.
It appears that the KB5063878 update may have other problems as well, according to additional findings by user X at Necoru_cat (also known as Nekorusukii). The report suggests a much more significant issue than just a failure during installation.
In the report, it is detailed that the user encountered problems regarding storage after installing the KB5063878 update. This update not only seems to be hiding solid-state drives (SSD) and hard-disk drives (HDD) from the operating system, but it also appears to permanently erase certain data stores in such a way that recovery becomes impossible.
What you need to know about storage issues with Windows 11 update KB5063878
According to Nekorusukii’s summary of their tests, Windows 11 drives may encounter issues where the SMART data becomes unreadable, causing the drives to disappear. While you might still be able to access the cached file structure (buffered tree), the actual files on these affected drives unfortunately become inaccessible.
The problem often arises when trying to write extensive amounts of data onto specific drives, particularly when the files exceed 50GB in size or the drive is over 60% full. Interestingly, this issue seems to affect both Solid State Drives (SSDs) and Hard Disk Drives (HDDs).
If you run into this problem, a system restart could potentially fix the drive’s performance, but the issue may reappear if you subject the drive to similar stress once more.
In a series of tests, Nekorusukii evaluated 21 solid-state drives (SSDs) from brands including Samsung, WD, Seagate, Corsair, SK hynix, Crucial, Solidigm, ADATA, HP, XPG, and Hanye. Based on the findings, they’ve speculated that issues may be linked to a Phison NAND controller.
Neokorusukii always restarted their computer after every action to clear its temporary files. After that, they constructed a 62GB file, packed it into a 7-Zip compressed folder, and placed it onto their Solid State Drive (SSD). In the end, they extracted the archive on the SSD currently under examination.
On the diagram, NG Level 1 indicates an SSD issue that was resolvable after restarting. When it comes to NG Level 2, this means the problem occurred and the data could not be restored even after a restart. It’s only the WD Blue SA510 2TB SATA SSD that proved unrecoverable. Other drives temporarily vanished from the OS but returned following a system restart.
The tests conducted were only on a single computer, leaving doubts about the extent to which this problem is prevalent among other devices. Additionally, it remains uncertain whether Windows 11 updates KB5063878 and KB5062660 are indeed responsible for the issue at hand.
According to my findings from diving into the latest tech news at Tom’s Hardware, Phison finally shared their official take on the matter on August 19th – quite exciting stuff for us tech enthusiasts!
Phison has learned about the broader implications of the Windows 11 updates KB5063878 and KB5062660, which might have affected several storage devices, including some that Phison supports. We acknowledge the inconvenience this may have caused and have already reached out to relevant industry players. Our dedication remains unwavering towards maintaining product quality and the achievements of our partners and clients. At present, we are evaluating the controllers potentially impacted by these updates, and we’re collaborating with our partners to address the issue. We will continue to keep affected partners informed with updates and advisories, providing support and ensuring necessary corrections are made.
Phison
As an observer, I’ve noticed that while the storage issue isn’t rampant, users on sites like Tom’s Hardware and NichePCGamer have reported experiencing it. This has expanded the list of possibly defective Solid State Drives (SSDs).
- Corsair Force MP600
- SSDs using the Phison PS5012-E12 controller
- KIOXIA EXCERIA PLUS G4 / KIOXIA M.2 SSDs
- Fikwot FN955
- SSDs using the InnoGrit controller
- Maxio SSDs
- SanDisk Extreme Pro 3D
In simpler terms, until Microsoft or other SSD manufacturers provide updates or solutions, it would be prudent to avoid large, continuous file transfers on computers running Windows 11 with the KB5063878 update, especially if you’re using a drive that has been highlighted in reports as potentially problematic.
Microsoft responds to reports of SSD issues with Windows 11 update KB5063878
The issue with SSD problems allegedly triggered by the Windows 11 update KB5063878 hasn’t yet been officially addressed with a fix by Microsoft, but they have publicly acknowledged the problem and stated that they are working alongside their partners to investigate it further.
Among the collaborators, Phison is involved, and they’ve mentioned their efforts with Microsoft to delve into and resolve the problem at hand.
According to naddy69, a Windows Central reader, it’s advisable not to install updates on Patch Tuesday because these updates might not always be the best option. Instead, it’s another reminder to regularly backup your essential data, as unexpected issues may occur.
Yet another reminder to back up your data
In my recent discourse, I discussed the potential dangers of exclusively using cloud storage for your data, citing numerous instances of high-profile data loss. Although certain users, even one who held a vast collection of data that was put on hold by AWS, managed to recover their data, many others were not as fortunate.
After witnessing some unexpected bugs causing physical SSDs to malfunction, it’s a good reminder for all to regularly backup their crucial data, just in case such incidents occur again.
To ensure safety, consider adhering to the basic principle of the 3-2-1 backup strategy. Even though this method may be deemed somewhat outdated by 2025, it still serves as an excellent foundation.
This means that you should maintain three backup copies of your data at all times. Two of these backups should be saved on distinct types of storage media or devices, and one copy should be kept off-site to protect against local disasters causing damage.
In today’s digital era, adhering to the 3-2-1 strategy could mean:
1. Keeping a personal copy of your files on your computer’s internal hard drive.
2. Storing another backup on an external drive or storage device.
3. Having a third version saved in a cloud storage service, which is located off-site.
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2025-08-24 16:11