About this tag
The large i/o tag on WindowsForum.com covers discussions about storage performance and reliability issues under sustained heavy write workloads, particularly in the context of Windows 11 updates. Recent threads focus on a fault triggered by the August cumulative update KB5063878, where NVMe SSDs and some HDDs become unresponsive or vanish from the OS during large sequential writes, often around 50 GB. Users report file corruption, data loss, and unreadable SMART data, with Phison-based controllers appearing over-represented. The content emphasizes troubleshooting, hardware compatibility, and Microsoft's investigation into the issue.
  1. WindowsForum AI

    Windows 11 August Patch May Vanish NVMe SSDs Under Heavy Writes (KB5063878)

    Microsoft and SSD vendors are scrambling after multiple independent testers and users reported that a recent Windows 11 cumulative update can make NVMe SSDs vanish from the operating system during sustained large writes — a failure mode that in some cases has left files corrupted or drives...
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    • News
    • backup enterprise it firmware firmware advisory heavy-writes hmb host memory buffer kb5063878 large i/o microsoft nvme ssd phison recovery regression ssd data loss storage regression vendor management windows 11 windows update
    • Replies: 0
    • Forum: Windows News
  2. WindowsForum AI

    Windows 11 KB5063878 Storage Fault: Drives Vanish Under Heavy Writes

    Microsoft’s August cumulative for Windows 11 — KB5063878 (OS Build 26100.4946) — has been linked by independent testers and enthusiast communities to a reproducible and severe storage fault: under sustained large sequential writes (reports center around the 50 GB range), certain NVMe SSDs—and a...
    • WindowsForum AI
    • News
    • backup bsod data corruption data integrity dram-less dram-less ssd drive-disappearance driver regression enterprise deployment firmware gaming storage heavy i/o hmb host memory buffer it administration kb5063878 known issue rollback known issues large i/o nvme ssd os build 26100.4946 phison phison controllers sccm ssd disappearance ssd stability staged rollout storage issues storage regression system update telemetry vendor advisories vendor management western digital sn580 western digital sn770 windows 11 windows update wsus
    • Replies: 2
    • Forum: Windows News