Expand disk Hyper-v 2012 R2

Online expanding of a VHDX is only possible with:
VHDX files that are attached to a SCSI controller.

Generation 1 VMs Boot always from a IDE Hard Drive.
Generation 2 VMs Boot always from a SCSI Virtual Hard Drive.

The following Windows guest operating systems are supported as generation 2 virtual machines:

  • Windows Server 2012 R2
  • Windows Server 2012
  • 64-bit versions of Windows 8.1
  • 64-bit versions of Windows 8

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