sync.ps1

Set-StrictMode -Version 'Latest'
[bool]$IsAdmin = ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(
                  [Security.Principal.WindowsBuiltInRole]::Administrator)
[ScriptBlock]$script = {Get-Volume | Select-Object -ExpandProperty DriveLetter | Foreach-Object{Flush-Volume -DriveLetter $_}}
if ($IsAdmin) {
    if (Get-Command 'Flush-Volume','Write-VolumeCache' -EA:4) {
        & {$script}
    } else {
        throw 'Error'
    }
} else {
    [HashTable]$startProcessArgs = @{
        FilePath     = "PowerShell.exe"
        ArgumentList = "-Command", "& {$script}"
        Verb         = "runas"
        WindowStyle  = "Hidden"
        PassThru     = $false
        Wait         = $true
    }
    Write-Debug "  Starting elevated shell with scriptblock: {$script}"
    Write-Debug "  Invoking Start-Process with args: $($startProcessArgs | Format-List | Out-String)"
    Start-Process @startProcessArgs
}