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I created a windows 7 virtual, and along the way, exported it to an external hard drive for backup. HyperV is hosted on a Windows Server 2008 R2 box. I really need to be able to restore the backup, but for 4 of them it says it can't import the virtual hard disk, and the last one begins to import, but I get the data cyclic check error (or whatever it is) and it fails to import.

Why doesn't this work if I exported from hyper V, and do I have any last hope other than to recreate a virtual?

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CRC errors usually relate to data loss, especially in something like a VHD. Often caused by file-system or drive troubles. What do "4 of them..and the last one" represent? – techie007 Aug 10 '11 at 4:46
Did you use the export feature? Did you check the box "Export only virtual machine configuration?" I'm assuming you are using Server 2008R2?? – surfasb Aug 10 '11 at 5:42
@surfasb I did use the export feature, but there was no "Export only virtual machine configuration?" option present. I reverified that last night after looking at a tutorial. – Brian Aug 10 '11 at 12:26
@techie007 I created 5 exports as backups, 4 failed, 1 worked but I got the CRC error. – Brian Aug 10 '11 at 12:27
To add to this, I would like to say that I examined the files and it exported a VHD, and some it exported a config, but not all. – Brian Aug 10 '11 at 12:28
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I would test the VHD file by NOT importing the machine, instead copy the VHD file somewhere safe (on the Server 2008 machine ideally), then create a new virtual machine. When it comes to the part about creating a new hard drive, instead browse for the existing VHD. See if this new machine will boot up - if not then there is something wrong with the VHD file itself and you probably don't have much hope of recovery. Good luck with it though!

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