TECH NEWS – If multiple files are written at once, the SSD could fail, which could be caused by the newest security update for Windows 11. This would cause a few miserable moments for the Redmond-based tech giant.

A thorough investigation by @Necoru_cat on Twitter revealed that, after the release of the Windows 11 KB5063878 security update a few days ago, storage drives reportedly fail when large files are written to them simultaneously. The user discovered this issue himself when updating Cyberpunk 2077 after applying the patch. These findings emerged from internal testing and benchmarking. Neither SSD manufacturers nor Microsoft have confirmed the problem, as it only appeared with the most recent updates. Failures allegedly occur after around 50 GB of continuous writing, and similar issues have also been reported with HDDs, so the issue is not exclusive to SSDs.

KB5063878のストレージ関係不具合のまとめ(8/15午前)
1.OS上からドライブがロストする(SMARTも読めなくなる)、バッファされているツリーにはアクセスできる場合もあるが、ファイルは読み込めない
2.特定のストレージへの大量の書き込みで発生
3.ドライブキャッシュの動作に不具合があると思われる…

— ねこるすきー (@Necoru_cat) August 14, 2025

KB6053878ストレージ不具合に関する検証結果の公表です_(:3 」∠)_
冒頭の一文、意味が理解できない人は読まないでください pic.twitter.com/XBqwOv8n5B

— ねこるすきー (@Necoru_cat) August 17, 2025

After long data-writing operations, the operating system may stop recognizing the SSD, and upon reboot, the drive’s partition may no longer be accessible. Affected SSDs include nearly every major controller brand: SMI, Innogrit, Samsung, Phison, and Western Digital. According to a list compiled by NichePCGamer, the following SSDs have been reported to experience issues after installing the patch: Corsair Force MP600, SSDs with the Phison PS5012-E12 controller, Kioxia Exceria Plus G4, Fikwot FN955, InnoGrit-powered SSDs, Maxio SSDs, and Kioxia M.2 SSDs, along with SanDisk Extreme Pro M.2 NVMe 3D SSD.

The issue is not yet widespread, as there are few reports on public forums, but the update could be linked to SSDs malfunctioning after large data writes. The most likely explanation is a storage driver or kernel-level regression introduced with the patch that mishandles long sequential writes, eventually causing the controller to crash. This results in the drive disappearing and the OS being unable to detect it.

For now, it is advised to avoid long sequential write operations, especially if your SSD model is on the affected list above.

Source: WCCFTech, Niche PC Gamer