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STATUS_VOLMGR_DISK_LAYOUT_TOO_MANY_PARTITIONS
STATUS_VOLMGR_DISK_LAYOUT_TOO_MANY_PARTITIONS means that the submitted layout exceeds a supported count. The relevant limit depends on the partition style and the API path, so it should not be diagnosed solely from the number of visible drive letters.
MBR and GPT have fundamentally different layout models. A basic GPT disk can hold many primary partitions, while an MBR design has the well-known primary/extended/logical arrangement. Imported layouts can also include hidden or recovery entries that consume part of the effective limit.
What to verify
- Read the partition style and the complete partition inventory, not just mounted volumes.
- Count hidden, OEM, recovery, and unused-layout entries relevant to the operation.
- Do not convert an existing disk merely to evade a limit without first validating boot mode, firmware support, recovery tooling, and a data-migration plan.
Microsoft: DRIVE_LAYOUT_INFORMATION_EX
Microsoft: MBR layouts with more than four partitions
UEFI Specification: GPT disk layout
Microsoft: Volume Manager error codes
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