Windows 7 VPC Unable to write to HD

I am suddenly getting the "unable to write to HD" error when opening my vpc.  I'm trying to run my vpc from vhds on my usb drive.


I thought I had fixed this issue by buying a new USB drive, but apparently its something else.  Help!  See my solution to this exact same problem.  

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/Windows_7/Q_24905241.html
tomandlisAsked:
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tomandlisConnect With a Mentor Author Commented:
Well, I figured it out.  Sort of.  I'd give points to someone who can tell me why this worked.

1. Copy the vhd file from USB to C: drive on your Win7 host.  
2. Copy the vhd file from the C: drive back to the USB
3. Create a new VMC pointing to the USB location of the VHD
4. Start it up and it should work

I think some permission was added to the file in the copy process, but I'm not sure.
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tomandlisAuthor Commented:
note that the 'solution' I had above didn't last...
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senadCommented:
are you using kaspersky ?
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msmamjiCommented:
What is the filesystem of the USB drive?
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ElrondCTCommented:
Should we understand that you got a particular VM running off the USB drive, but now that same VM doesn't work? Or do you have one VM that works, and another that you tried to move to the same place but it doesn't work?

If you open the .vmc file in Notepad or another editor, is the path for the .vhd disk file properly specified? It'll be listed two ways, as an absolute type (with the full path) and as a relative type (which normally starts from the path the .vmc file is in). It's sufficient if one or the other is correct, but I can't tell you what will happen if both of them point to a valid disk file.
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tomandlisAuthor Commented:
Elrond, yes this exact setup used to work on this exact computer.  That is, I had the vhd on the USB and it ran Win 7 off a Win 7 host.

I started using a different computer running an XP host and that worked too.  I ran that setup for several months.  Now I'm back on Win7 host and the original setup doesn't work

I did find a workaround.  By copying the file to the c: drive on the win7 host I can run it.  Not sure why.
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tomandlisAuthor Commented:
I would rather do without the workaround and run it from USB.  Any ideas how I can do that agin?
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ElrondCTCommented:
When you move the disk, how are you changing where VPC looks for the disk? Are you clicking on Settings for the VM (in the VPC Console) and changing the location of Hard Disk 1 there?

When do you get the error? Does the VM begin to start up at all, or does the error appear as soon as you click Start in the VPC Console? What is the complete and exact error message you get? What is the size of your .vhd disk file? How much free space do you have on your USB drive?
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tomandlisAuthor Commented:
msmamji: the USB hard drive file system is NTFS

Q: When you move the disk, how are you changing where VPC looks for the disk?
A: I created a new vpc setup on the Win7 host

Q: Are you clicking on Settings for the VM (in the VPC Console) and changing the location of Hard Disk 1 there?
A: Yes.  There are two hard drives associated with the VPC (not one).

Q: When do you get the error? Does the VM begin to start up at all, or does the error appear as soon as you click Start in the VPC Console?
A: It give me a little progress meter and for about 30 seconds it appears to be working, but then I get the "Windows 7 VPC Unable to write to HD" message and that is all I get.

Q: What is the complete and exact error message you get?
A: Windows 7 VPC Unable to write to HD

Q: What is the size of your .vhd disk file?
A: About 30 GB.

Q: How much free space do you have on your USB drive?
A: About 300 GB
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tomandlisAuthor Commented:
btw, on win7 the VMC files are now VMCX files.  So replace all VMC's above with VMCX.
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ElrondCTCommented:
Very odd. I haven't yet upgraded to Win7, so I can't play around with this myself. I have no idea why the copy back and forth would make any difference to the situation.

I suggest you accept your post as the solution, so that the information is available for others who may run into the same problem.
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tomandlisAuthor Commented:
Yes, odd.  I think Win7 implements some sort of new security that may be related to this.  I think it works something like the OS has more trust for certain drives, like the C: drive than other drives, but I'm not sure how it all works.
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