Windows 11 July 2026 Updates and the Samsung T9 SSD Partition Issue: What Is Confirmed and What Is Not - window-tip

Microsoft released its July 14, 2026 Windows 11 security updates alongside a separate cumulative update for .NET Framework, bringing security fixes, reliability changes and previously released preview improvements to supported versions of Windows 11. Some systems subsequently showed problems ranging from update failures and driver instability to external storage behaving unexpectedly. Reports involving Samsung T9 external SSDs are particularly concerning because affected drives could still be detected while their partitions appeared to disappear, but there is currently not enough evidence to establish KB5100998 or KB5101650 as the confirmed cause of a general Samsung T9 compatibility problem.

1. What Microsoft Released on July 14, 2026
2. What KB5101650 Changes in Windows 11
3. What KB5100998 Actually Updates
4. The Reported Samsung T9 Partition Problem
5. Why a .NET Update Is an Unusual Suspect for an SSD Problem
6. Why Uninstalling an Update Does Not Prove Causation
7. Other Issues Around the July Windows Update
8. What to Do If an External SSD Loses Its Partition
9. How the Situation Should Be Interpreted
10. Tags

What Microsoft Released on July 14, 2026

The July 2026 update cycle included separate packages for different Windows 11 releases. Windows 11 versions 24H2 and 25H2 received KB5101650, while version 23H2 received KB5099414. Windows 11 version 26H1 received KB5101649.

Windows Version	Main July Update	Resulting Build	Purpose
Windows 11 23H2	KB5099414	22631.7376	Security fixes and cumulative quality improvements
Windows 11 24H2	KB5101650	26100.8875	Security fixes and cumulative quality improvements
Windows 11 25H2	KB5101650	26200.8875	Security fixes and cumulative quality improvements