I recently had a network issue causing an iSCSI LUN containing my Server 2012 R2 Hyper-V VHDX files to drop for a split second. Unfortunately for me, this was enough to cause the entire data drive VHDX file for my file server to become corrupt. The VM wouldn’t even start, giving the error: “The application encountered an error while attempting to change the state of ‘VMNAME’. ‘VMNAME’ failed to change state.” Additionally, if I tried to inspect the disk within Hyper-V Manager, it gave the error: “An error occurred when attempting to retrieve the virtual hard disk ‘F:Hyper-VVirtual Hard DisksVMNAMEdisk-1.vhdx’ on server HVSERVER.corp.local. Failed to get the disk information. An unexpected error occurred: The file or directory is corrupted and unreadable. (0x80070570).”
Everything I came across online in my feverish searching seemed to apply only to VHD files and older versions of Hyper-V. Nothing would read it. I then came across this article which dashed all of my hopes of recovering it: ://blog/s.msdn.com/b/virtual_pc_guy/archive/2009/01/07/how-do-i-fix-a-corrupted-virtual-hard-disk.aspx. Towards the bottom of it reads this line: “If Virtual PC / Virtual Server / Hyper-V report that the virtual hard disk is corrupt – then one of the header / footer sections has been corrupted – and there is nothing that you can do.”
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