function ConvertTo-ByteUnits

function ConvertTo-ByteUnits
    {
    [CmdletBinding()]
    Param (
        [Parameter (
            Position = 0,
            Mandatory)]
            [int64]
            $Size
        )

    begin {}

    process
        {
        $Sign = [math]::Sign($Size)
        $Size = [math]::Abs($Size)
        switch ($Size)
            {
            {$_ -gt 1TB }
                {$Unit = 'TB'; break}
            {$_ -gt 1GB }
                {$Unit = 'GB'; break}
            {$_ -gt 1MB }
                {$Unit = 'MB'; break}
            {$_ -gt 1KB }
                {$Unit = 'KB'; break}
            default
                {$Unit = 'B'}
            }

        if ($Unit -ne 'B')
            {
            '{0:N2} {1}' -f ($Sign * $Size / "1$Unit"), $Unit
            }
            else
            {
            '{0} {1}' -f ($Sign * $Size), $Unit
            }

        } # end >> process

    end {}

    } # end >> function