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VDS_E_IA64_BOOT_MIRRORED_TO_MBR
VDS_E_IA64_BOOT_MIRRORED_TO_MBR is a legacy Virtual Disk Service code whose MS-VDS entry is explicitly marked “Not used.” The documented condition is a boot volume on a GPT disk mirrored to an MBR disk, where the secondary plex cannot be used to boot the machine.
Treat the HRESULT as historical protocol identity
The same VDS error table also defines a success-status variant, VDS_S_IA64_BOOT_MIRRORED_TO_MBR, for the bootability warning. Because the error value is documented as unused, software should not invent a modern recovery sequence from the constant name or assume that it represents current UEFI boot repair behavior.
What to verify
- Confirm the numeric HRESULT and source before mapping an archived trace to this symbolic name.
- Preserve the disk partition styles and mirror topology when analysing legacy IA64 or VDS-era diagnostics.
- If the value appears in current software, identify the component that emitted it; that implementation context is more authoritative than guesses based on the old name.
References
- Microsoft Open Specifications: IA64 boot mirror VDS codes
- Microsoft: Virtual Disk Service common return codes
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