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Neil
95cd6969a0
WSL2 keeps the guest filesystem in a dynamically-expanding ext4.vhdx. Deleting files inside the distro frees the blocks for ext4 to reuse but never shrinks the host-visible file, so engineers watching speculative worktree preparation and mirrored worktrees write into a distro see the vhdx grow and reasonably ask whether we leak disk. Records the measurement taken on WSL 2.7.11.0 / Ubuntu-24.04 (a second fresh incompressible 1 GiB after deleting the first cost zero growth, measured as size on disk via GetCompressedFileSize), how to locate the vhdx across all three install layouts, and a complete elevated diskpart recipe for compacting existing slack. Scopes the sparse-flag observation to the measured machine and states that peak-tracking is the best case for block reuse, not a guarantee against drift. The reclaim steps state their preconditions rather than reading as directly runnable: --set-sparse needs the distro stopped and WSL 2.5 or newer. .wslconfig is given as %UserProfile%\.wslconfig -- it lives in the Windows user profile, not inside the distro at ~/.wslconfig. Per-platform delta: documentation only, no production code. No behavior change on macOS, Linux, native Windows, WSL, SSH, relay, folder workspaces, or any git provider.