Transfer-Speed.ps1

$size = 20Mb # Size in bits, eg 1Mb / 1Gb
$dest = 'Z:\Destination\'

fsutil file createnew "C:\temp\test.dat" ($size)

$Write =  Measure-Command { Copy-Item "C:\temp\test.dat" "$dest\test.dat" }
$WriteMbps = [Math]::Round( (($size * 8) / $w.TotalSeconds) / 1Mb, 2 )

rm "C:\temp\test.dat"

$Read =  Measure-Command { Copy-Item "$dest\test.dat" "C:\temp\test.dat" }
$ReadMbps = [Math]::Round( (($size * 8) / $w.TotalSeconds) / 1Mb, 2 )

rm "$dest\test.dat"

Write-Output "Write speed $WriteMbps Mbps"
Write-Output "Read speed $ReadMbps Mbps"