Have OSDCloud wipe OEM Partitions automatically

OSDCloud does not handle OEM partitions during the disk wipe phase

we solved this using the following function - HP is called out in the popup prompt that we are exposing to our Desktop Techs as we are primarily a HP shop, but this handles all OEM and their partition settings.

        #Starting the Custom Gui

        $parts = (Get-Partition | Select-Object type,isboot,nodefaultdriveletter)

        $showPrompt = $false

        foreach ($part in $parts) {

            if ($part.type -ieq 'basic' -and !$part.isboot -and $part.nodefaultdriveletter) {

                $showPrompt = $true

            }

        }



        if ($showPrompt) {

            Add-Type -AssemblyName PresentationCore, PresentationFramework

            $response = [system.windows.messagebox]::show('An HP OEM partition has been detected on this device.  This can sometimes prevent OSDCloud from properly cleaning the drive before reinstalling Windows.  Press Yes below to pre-wipe the drive to circumvent this issue.



Do you want to pre-wipe the internal hard drive?', 'OEM Partition detected!', 'yesno')

            if ($response -eq 'Yes') {

                Write-Host 'Wiping the internal drive'

                Set-DriveCleanup

                Write-Host 'Internal Drive Successfully'

            } else {

                Write-Host 'Not wiping drive'

            }

        }

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Patrick Davis

May 14, 2026

here is the Set-DriveCleanup function for review:

function Set-DriveCleanup {

    <#

    .SYNOPSIS

    Function to clean the internal drive of a machine during OSDCloud before the OSDCloudGui loads



    .EXAMPLE

    Set-DriveCleanup



    .INPUTS

    None

    You cannot pipe objects to Set-DriveCleanup.



    .OUTPUTS

    None

    The cmdlet does not return any output.

    #>



    [CmdletBinding()]

    param()

    #Get all non-removable drives and their size - accounts for USB media not being pulled from device.

    $Drives = Get-CimInstance -Class Win32_DiskDrive | Where-Object { $_.MediaType -ne 'Removable Media' } | Sort-Object Size -Descending



    #Accounts for USB Media being pulled out or broken internal device drive.

    if ($Drives.Count -eq 0) {

        Write-Host 'No Internal drives found in this device.'

        return

    }



    #The largest non-removable drive is the first one in the sorted list

    $LargestDrive = $Drives[0]

    Write-Host "Largest non-removable drive detected: $($LargestDrive.DeviceID) with size $($LargestDrive.Size / 1GB) GB."



    #Clean the drive

    Clear-Disk -Number $Drives[0].Index -RemoveData -RemoveOEM -PassThru -Confirm:$false -Verbose

    #Initialize the drive

    Initialize-Disk -Number $Drives[0].Index -Confirm:$false -PartitionStyle GPT -Verbose

    #Partition the drive

    New-Partition -DiskNumber $Drives[0].Index -UseMaximumSize -AssignDriveLetter | Format-Volume -FileSystem NTFS -Confirm:$false -Verbose

    #Closing Message

    Write-Host "Drive $($LargestDrive.DeviceID) has been wiped. Now presenting the Imaging GUI"

}

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Have OSDCloud wipe OEM Partitions automatically