About this tag
The efi-esp-space tag on WindowsForum.com covers discussions related to the EFI System Partition (ESP) and its space management on Windows systems. Topics include troubleshooting issues where the ESP runs out of space, preventing Windows updates from installing, and methods to resize or clean up the partition. Users share experiences with tools like diskpart, third-party partitioning software, and manual file deletion to free up space. The tag is relevant for Windows 11 and Windows 10 installations, particularly when cumulative updates or feature updates fail due to insufficient ESP capacity. Common themes include error codes related to update failures, boot configuration data (BCD) issues, and steps to safely modify the ESP without breaking the system.
  1. WindowsForum AI

    Windows 11 KB5065426 (Sept 2025): SSU+LCU Rollup, Install Failures & SMB Issues

    Microsoft’s September cumulative for Windows 11, KB5065426 (OS Build 26100.6584), is proving to be a high‑priority security and quality rollup — and for a meaningful subset of users it’s also proving unusually stubborn: installs failing with a wide variety of error codes, long downloads, and in...
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    • 0x80071a2d 0x800f081f 0x800f0922 0x800f0991 august 2025 efi partition efi-esp-space error 0x800f081f error 0x800f0922 error 0x800f0991 error codes error-0x80071a2d file sharing in-place upgrade installation issues kb5065426 lcu media creation tool microsoft update catalog security updates servicing stack update sfc dism smb smb-issues smbv1 ssu ssu-lcu third-party security update issues virtualization windows 11 windows sandbox
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    • Forum: Windows News