What does HRESULT 0x80042468 (VDS_E_MAX_USABLE_MBR) mean?

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Only the first 2TB are usable on large MBR disks.  Cannot create partitions beyond the 2TB mark, nor convert  the disk to dynamic.

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VDS_E_EXTEND_FILE_SYSTEM_FAILED	VDS_S_GPT_BOOT_MIRRORED_TO_MBR

VDS_E_MAX_USABLE_MBR

VDS_E_MAX_USABLE_MBR means the requested layout exceeds the practical 2 TB addressing limit of MBR. The storage task cannot create usable partitions beyond that boundary under the current partition style.

What to check

Confirm whether the disk is MBR and whether the intended capacity requires GPT.
Plan any MBR-to-GPT conversion with special care on boot disks and systems that must remain bootable.
Back up data and validate firmware/boot compatibility before changing partition style.

Get-Disk | Format-Table Number,PartitionStyle,Size,FriendlyName

Virtual Disk Service is a legacy COM API. On Windows 8 and Windows Server 2012 and later, inspect and manage supported storage through the Storage Management API and the Storage PowerShell cmdlets.

Microsoft: Get-Disk

Microsoft: DiskPart

Microsoft: VDS error codes

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