Wait for optical media to be inserted (DVD, Blu-Ray, CD, etc.), then end the function.

Wait-Disc.ps1

function Wait-Disc {
    [CmdletBinding()]
    param (
        [Parameter()]
        [int]
        $DriveIndex = 0
    )

    # Derive drive letter
    $DriveLetter = ($DriveInfo | Select-Object -ExpandProperty Drive)[$DriveIndex]

    # Create a WMI query to monitor the optical drive
    $WMIQuery = "SELECT * FROM __InstanceModificationEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_CDROMDrive' AND TargetInstance.Drive = '$DriveLetter'"

    # Create a management scope and event watcher
    $ManagementScope = New-Object System.Management.ManagementScope("\\.\root\cimv2")
    $ManagementScope.Connect()

    $EventWatcher = New-Object System.Management.ManagementEventWatcher
    $EventWatcher.Query = New-Object System.Management.WqlEventQuery($WMIQuery)
    $EventWatcher.Scope = $ManagementScope

    # Define the event handling script block
    $EventHandler = {
        $WMIEvent = $event.SourceEventArgs.NewEvent
        $WMIDrive = $WMIEvent.TargetInstance

        if ($WMIDrive.MediaLoaded) {
            Write-Host "Disc detected in drive $DriveLetter"
            $EventWatcher.Stop() 
        }
    }

    # Register the event handler, hiding its output.
    Register-ObjectEvent -InputObject $EventWatcher -EventName EventArrived -Action $EventHandler | Out-Null

    Write-Information -InformationAction Continue "Waiting for a new disc to be inserted..."

    # Start listening for events
    $EventWatcher.Start()

    # Wait for the event handler to stop the watcher
    $EventWatcher.WaitForNextEvent() | Out-Null

    # Unregister the event handler
    Unregister-Event -SourceIdentifier $EventWatcher.Name | Out-Null
}