Device harddiskvolume4 windows system32 svchost exe

When using Windows, you might run into messages that talk about specific hard disk volumes like \Device\HarddiskVolume3. At first, these messages might seem a bit tricky to get, but actually, they’re pretty straightforward once you know what to do.

In this guide, we’ll break down what these hard disk volume references mean and show you how to figure out which drive they’re talking about in Windows 11 or Windows 10. We’ll go step by step so you can find the specific device or volume path you need to sort out any issues with file access events.

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Understanding hard disk volume references

Before we get into finding hard disk volume references in Windows, let’s first get what they are and why we use them.

Also see: How to hide a drive in Windows 11

In Windows, hard disk volumes help organize data on physical hard drives. Each volume gets a unique reference, like:

• \Device\HarddiskVolume3
• \Device\HarddiskVolume4
• \Device\HarddiskVolume5
• \Device\HarddiskVolume1
• \Device\HarddiskVolume2
• \Device\HarddiskVolume6

This reference is how Windows identifies and accesses the volume’s contents.

Картинка с сайта: www.windowsdigitals.com

When fixing issues in Windows, you might see error messages pointing to a certain hard disk volume. Like, you could get a message saying:

\Device\HarddiskVolume3\Windows\System32\svchost.exe is missing or corrupted

This means Windows can’t find the svchost.exe file on the third hard disk volume, and you’ll need to find that volume and the file to fix the problem.

Related issue: Service Host Local System (svchost.exe) high CPU, disk, or memory usage

How to tell which drive is \Device\HarddiskVolume3 or other volumes?

Now that we know what hard disk volume references are, let’s see how to find the hard disk volume number and figure out which drive it’s pointing to in Windows 11/10.

Method 1: Listing all drive letters and hard disk volume numbers using PowerShell

This method gives you a full list of all device names and their matching volume paths on your computer. It uses PowerShell to check the Windows Management Instrumentation (WMI) class Win32_Volume for the drive letter and then gets the device path through the QueryDosDevice function from the Kernel32 module.

To list all the drive letters and their matching hard disk volume numbers on your Windows system, do this:

1. Open Notepad and paste the following PowerShell script.

   $DynAssembly = New-Object System.Reflection.AssemblyName('SysUtils')
   $AssemblyBuilder = [AppDomain]::CurrentDomain.DefineDynamicAssembly($DynAssembly, [Reflection.Emit.AssemblyBuilderAccess]::Run)
   $ModuleBuilder = $AssemblyBuilder.DefineDynamicModule('SysUtils', $False)
    
   $TypeBuilder = $ModuleBuilder.DefineType('Kernel32', 'Public, Class')
   $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod('QueryDosDevice', 'kernel32.dll', ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [UInt32], [Type[]]@([String], [Text.StringBuilder], [UInt32]), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto)
   $DllImportConstructor = [Runtime.InteropServices.DllImportAttribute].GetConstructor(@([String]))
   $SetLastError = [Runtime.InteropServices.DllImportAttribute].GetField('SetLastError')
   $SetLastErrorCustomAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($DllImportConstructor, @('kernel32.dll'), [Reflection.FieldInfo[]]@($SetLastError), @($true))
   $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute)
   $Kernel32 = $TypeBuilder.CreateType()
    
   $Max = 65536
   $StringBuilder = New-Object System.Text.StringBuilder($Max)
    
   Get-WmiObject Win32_Volume | ? { $_.DriveLetter } | % {
   	$ReturnLength = $Kernel32::QueryDosDevice($_.DriveLetter, $StringBuilder, $Max)
   	
   	if ($ReturnLength)
   	{
   		$DriveMapping = @{
   			DriveLetter = $_.DriveLetter
   			DevicePath = $StringBuilder.ToString()
   		}
   		
   		New-Object PSObject -Property $DriveMapping
   	}
   }
   

   

   Картинка с сайта: www.windowsdigitals.com

2. Save the Notepad file as a .ps1 file, like List-drives-and-hard-disk-volumes.ps1.
   

   Картинка с сайта: www.windowsdigitals.com

3. Run the List-drives-and-hard-disk-volumes.ps1 script in PowerShell to see all the drive letters and their hard disk volume paths on your Windows 11 or Windows 10 system.
   

   Картинка с сайта: www.windowsdigitals.com

Recommended resource: Run CMD, PowerShell, or Regedit as SYSTEM in Windows 11

To run the List-drives-and-hard-disk-volumes.ps1 script in PowerShell, just follow these steps:

1. Open PowerShell as an admin by right-clicking the Start button, picking “Windows PowerShell (Admin)” or “Windows Terminal (Admin)” if you’re using Windows Terminal, and saying “Yes” to the User Account Control (UAC) prompt.
   

   Картинка с сайта: www.windowsdigitals.com

2. If needed, change the execution policy by typing

   Set-ExecutionPolicy RemoteSigned

   and hitting Enter. Say Y to confirm. This lets you run scripts you’ve made or downloaded as long as they’re signed by someone trustworthy.

3. Go to where you saved the script using the cd command. For example, if it’s on the Desktop, type

   cd C:\Users\username\Desktop

   and press Enter. Swap in your actual Windows username.

4. To run the script, type

   .\List-drives-and-hard-disk-volumes.ps1

   and hit Enter. You’ll see the device names and their paths for all drives on your computer.

   

   Картинка с сайта: www.windowsdigitals.com

5. It’s a good idea to set the execution policy back to its default after running the script by typing

   Set-ExecutionPolicy Restricted

   

   Картинка с сайта: www.windowsdigitals.com

You need admin rights to run the script since it touches on system info.

Useful tip: How to merge two drives in Windows 11

Here’s a deeper look at what the script does:

1. It makes a dynamic assembly named ‘SysUtils’ and sets up a method to call the QueryDosDevice function from the Kernel32 module.
2. The StringBuilder object’s max length is set to 65536 to hold the device path info.
3. Then it uses Get-WmiObject to ask the Win32_Volume class for drive letter details, only keeping results that have a drive letter.
4. For each drive letter, it calls the QueryDosDevice function with the drive letter as input. The function returns the device path string’s length, which is then put into an object that has both the drive letter and device path.
5. Last, it shows the device letter and path for each drive.

Similar problem: Hard drive doesn’t show up after clone in Windows 11

Method 2: Getting the hard disk volume number from a specific drive letter using PowerShell

This method lets you find the device path for a specific drive letter using a similar approach as Method 1. But instead of listing all device names and their paths, it asks you for a drive letter and gives back its device path.

To see the device path for a specific drive letter, use this PowerShell script:

1. Open Notepad and paste in the PowerShell script below.

   $driveLetter = Read-Host "Enter Drive Letter:"
   Write-Host " "
   $DynAssembly = New-Object System.Reflection.AssemblyName('SysUtils')
   $AssemblyBuilder = [AppDomain]::CurrentDomain.DefineDynamicAssembly($DynAssembly, [Reflection.Emit.AssemblyBuilderAccess]::Run)
   $ModuleBuilder = $AssemblyBuilder.DefineDynamicModule('SysUtils', $False)
    
   $TypeBuilder = $ModuleBuilder.DefineType('Kernel32', 'Public, Class')
   $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod('QueryDosDevice', 'kernel32.dll', ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [UInt32], [Type[]]@([String], [Text.StringBuilder], [UInt32]), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto)
   $DllImportConstructor = [Runtime.InteropServices.DllImportAttribute].GetConstructor(@([String]))
   $SetLastError = [Runtime.InteropServices.DllImportAttribute].GetField('SetLastError')
   $SetLastErrorCustomAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($DllImportConstructor, @('kernel32.dll'), [Reflection.FieldInfo[]]@($SetLastError), @($true))
   $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute)
   $Kernel32 = $TypeBuilder.CreateType()
    
   $Max = 65536
   $StringBuilder = New-Object System.Text.StringBuilder($Max)
   $ReturnLength = $Kernel32::QueryDosDevice($driveLetter, $StringBuilder, $Max)
    
    if ($ReturnLength)
    {
        Write-Host "Device Path: "$StringBuilder.ToString()
     }
     else
     {
         Write-Host "Device Path: not found"
     }
   Write-Host " "
   

   

   Картинка с сайта: www.windowsdigitals.com

2. Save it as a .ps1 file, like Get-device-path-from-drive-letter.ps1.
   

   Картинка с сайта: www.windowsdigitals.com

3. Run the Get-device-path-from-drive-letter.ps1 script in PowerShell. When asked, type the drive letter you want the device path for.
   

   Картинка с сайта: www.windowsdigitals.com

For how to run the .ps1 PowerShell script you’ve made, just follow the steps in the method above.

Here’s what the script does:

1. Like Method 1, it creates ‘SysUtils’ and sets up a way to use the QueryDosDevice function from the Kernel32 module.
2. It asks for a drive letter with the Read-Host command. Remember to enter it without the backslash (like “C:”, not “C:\”).
3. The StringBuilder object’s max length is set to 65536, so it can hold the device path info.
4. Then it calls QueryDosDevice with the input drive letter. If it works, it returns the length of the device path string.
5. If QueryDosDevice works out, the script shows the device path for the drive letter. If not, it says the device path wasn’t found.

One final note

One more thing to remind you is that although these methods do help you track down disk volume paths and drive letters, you have to know that the volume numbers can sometimes change. For instance, plugging in a new hard disk drive or SSD, creating a new partition, etc. can sometimes shuffle the numbers. When things don’t go as planned, double-check the volume paths and drive letters again to make sure you are working with the correct volume.

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