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In Win7 you can attach a VHD as a drive, however after a reboot the VHD is no longer attached. Is there anyway to make it permanent?

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up vote 11 down vote accepted

I don't see a way to re-attach it at boot "natively". You could use a "startup script" with the DISKPART commands to re-attach it, or deploy a script in the "Startup" program group to re-attach it after logon. That's disappointing and hackish, but at least it would give you what you wanted.

@echo off
echo SELECT VDISK FILE=(vdisk filename here)>%TEMPFILE%

It's sad, but it's the best I can see to do for now...

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This works great from an elevated command prompt. It doesn't work from the startup program group however. Something about the permissions makes it not execute the DISKPART correctly. – rein Jul 10 '09 at 13:55
Yeah... UAC is a pain. It should work fine from a startup script, since that runs as SYSTEM and is, by definition, elevated. – Evan Anderson Jul 10 '09 at 13:57
Yes thanks, putting into the group policy startup script works for me. – rein Jul 10 '09 at 14:08
Does anyone successful implement this ? I've got "The arguments specified for this command are not valid. For more information on the command type: HELP SELECT VDISK" message. – Funky81 Sep 4 '09 at 1:16
+1 for %RANDOM%. Just because it's new to me. :-) – mpbloch Apr 13 '10 at 23:08

Another way is to attach on service level. You need instsrv.exe and srvany.exe from Windows Resource Kit Tools. Put them to any folder with the following files:


@echo off
cd %~dp0
copy srvany.* c:\windows\system32\
copy srvany-attach-disk-W c:\windows\system32\
instsrv disk_W_attach "c:\windows\system32\srvany.exe"
regedit disk-W-install-permanently.reg


Windows Registry Editor Version 5.00

"AppParameters"="/c srvany.bat"


@echo on 
set log=%temp%\srvany.log

echo log: Running at %date% %time% >>%log%
diskpart /s srvany-attach-disk_W >>%log%
net stop disk_W_attach


select vdisk file=”D:\private\vm\HDD\disk_W.vhd"
attach vdisk

dir /b


Now edit script srvany-attach-disk_W to point to your VHD, execute disk-W-install-permanently.cmd with admin privileges and reboot. That's all!

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The built-in "SC" will do what "INSTSRV" does in your text above. Running a service to start a batch file seems a little dodgy to me. I'd just run a startup script and be done with it. – Evan Anderson Sep 4 '09 at 1:22

You can try using VHD attach. It has option to attach VHD after each boot. Since one part runs as service, no UAC prompt will bother you.

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VHD attach program worked for me. It attaches VHD for all the users. No need to create a start up script or scheduled task. The program attaches VHD itself. you just need to install the program. Attach your VHD file once or go to options -> Add the VHD file and select Auto Attach. Thanks Josip. You are awesome

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I made a program for this,, Free and still updated all the time. It will be a service on the next release. And its free to distribute since i needed it and the above mentioned was not available. I figure if i needed it and it was not around then i would let everyone have it for free. The one mentioned above (" VHD Attach" ) i believe was made with VB Also this month i am releasing a version for server 2003 and XP. :) Please pass to everyone that needs it and check back for updates on my site. Happy VHD'ing

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There is no native way to do this - Windows does not currently persist attached VHDs across a reboot. A system startup script is going to be your best bet.

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I created a batch file that uses diskpart /s and specifies a script to use that attaches my various VHD files. Then I created a scheduled task to execute during startup.

Here is a page I created with a step by step process to do it.

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Put the same diskpart /s command into task sheduler with 'highest privileges' checked and 'run it on computer startup'. It works for me (not for boot disk), mounts vhd even before user logs on.

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