private static string FormatBytes(long bytes)
{
    string[] sizes = { "B", "KB", "MB", "GB", "TB", "PB" };
    var order = 0;

    while (bytes >= 1024 && order < sizes.Length - 1)
    {
        order++;
        bytes /= 1024;
    }

    return $"{bytes:0.##} {sizes[order]}";
}