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Add configurable FFU build partition drive letters

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Add System, Windows, and Recovery partition drive-letter settings to the Hyper-V Settings UI, config save/load, BuildFFUVM parameters, and sample/docs. Defaults remain S, W, and R.

Validate selected letters early, log validation failures for the UI, include drive-letter metadata in VHDX cache matching, and normalize legacy malformed cache values. This only affects FFU build-time partitioning; ApplyFFU deployment letters remain unchanged.
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rbalsleyMSFT
2026-06-05 09:46:00 -07:00
parent c32cb93434
commit 9fb9e81701
10 changed files with 262 additions and 21 deletions
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docs/hyperv_settings.md
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@@ -43,6 +43,20 @@ Default is `$FFUDevelopmentPath\VM`. This is the location of the VHDX that gets
Prefix for the generated VM. Default is _FFU.
## System Partition Drive Letter
Drive letter used for the System partition while building the FFU VHDX. Default is `S`.
## Windows Partition Drive Letter
Drive letter used for the Windows partition while building the FFU VHDX. Default is `W`.
## Recovery Partition Drive Letter
Drive letter used for the Recovery partition while building the FFU VHDX. Default is `R`.
These settings only affect FFU creation. They do not change the hard-coded drive letters used by `ApplyFFU.ps1` during deployment.
## Logical Sector Size
Uint32 value of 512 or 4096. Useful for 4Kn drives or devices shipping with UFS drives. Default is 512.