26100.4946

About this tag
The tag 26100.4946 refers to OS build 26100.4946, which is the build number for Windows 11 version 24H2 after applying the August 12, 2025 cumulative update KB5063878. Discussions on this tag cover issues encountered with this build, including delivery failures via WSUS and SCCM/MECM, storage regressions causing NVMe SSDs to disappear under heavy I/O, and broader concerns about platform stability. The update also includes servicing stack updates, AI-component refreshes, and a warning about Secure Boot certificate expiry. IT administrators and users share troubleshooting steps, workarounds, and discussions about risk management and backup discipline.

  1. Windows 11 24H2 KB5063878: WSUS Delivery Failure and KIR Rollback

    Microsoft and community reports confirm that the August 12, 2025 cumulative update for Windows 11, version 24H2 (KB5063878, OS build 26100.4946) experienced delivery failures when distributed through on‑premises update infrastructure—principally Windows Server Update Services (WSUS) and...
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    • 24h2 26100.4946 enterprise it installation guide kb5063878 known issue rollback microsoft update catalog ntdll release health sccm servicing stack update update delivery windows 11 windows 11 24h2 windows update wsus wuauserv
    • Replies: 0
    • Forum: Windows News

  2. Windows 11 24H2 August Update KB5063878: Drives Vanish Under Heavy IO

    The latest Windows cumulative update has landed with a thud: a growing number of users report that Windows 11 version 24H2’s August security rollup (KB5063878, OS Build 26100.4946) can make drives disappear under heavy I/O, and the fallout has reignited debates about privacy, platform stability...
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    • 26100.4946 ai privacy backup copilot data recovery dual boot empty drives firmware hdd heavy i/o i/o error it admin kb5063878 migration recall feature ssd storage stack windows 11 windows update wsus
    • Replies: 0
    • Forum: Windows News

  3. Windows 11 24H2 August Update Triggers NVMe Storage Regression (KB5063878)

    Microsoft’s latest cumulative for Windows 11 24H2 has been tied to a small but serious cluster of storage failures that can make NVMe SSDs disappear during heavy writes and, in a handful of cases, leave data unreadable — a scare that underscores why updating and backup discipline still matters...
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    • 24h2 26100.4946 august 2025 backup data integrity data recovery dism dram-less ssd enterprise deployment firmware hardware compatibility heavy i/o workloads heavy-writes host memory buffer it admin kb5063878 known issue rollback nvme nvme ssd phison controllers release health rollback sccm ssd ssd disappearance ssd firmware storage regression support guidance vendor diagnostics windows 11 windows 11 24h2 windows update wsus
    • Replies: 1
    • Forum: Windows News

  4. Windows 11 24H2 August 2025 KB5063878: SSU+LCU, AI updates, and Secure Boot expiry

    Microsoft has shipped the August 12, 2025 cumulative security update for Windows 11, version 24H2 (KB5063878, OS Build 26100.4946), a routine Patch Tuesday release that combines the latest servicing stack update with the monthly cumulative update, patches a range of security issues, and contains...
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    • 24h2 26100.4946 ai components ai updates certificate expiration copilot dual boot firmware it administration kb5063878 kek ca 2023 lcu oem oem firmware patch sccm secure boot secure boot certificates servicing stack update ssu uefi windows 11 windows 11 24h2 windows update for business wsus wsus-sccm
    • Replies: 1
    • Forum: Windows News