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internal static class Extensions
{
	// Unit specifications
	private static string[][] byteUnits = new string[][]
	{
		new string[] { "bytes", "bytes" },
		new string[] { "kB", "kilobyte" },
		new string[] { "MB", "megabyte" },
		new string[] { "GB", "gigabyte" },
		new string[] { "TB", "terabyte" },
		new string[] { "PB", "petabyte" },
		new string[] { "EB", "exabyte" },
	};
	internal static string ToByteUnitString(this long byteCount, bool abbreviatedName = true)
	{
		int i = Convert.ToInt32(Math.Floor(Math.Log(byteCount, 2) / 10f));
		if (i == 0)
			return string.Format("{0} {1}", byteCount, (abbreviatedName) ? byteUnits[i][0] : byteUnits[i][1]);
		return string.Format("{0:F2} {1}", byteCount / Math.Pow(1024, i), (abbreviatedName) ? byteUnits[i][0] : byteUnits[i][1]);
	}
}

Example:

void Main()
{
	var sizeString = new DriveInfo("C").AvailableFreeSpace.ToByteUnitString();

	// test all units -- unit in abbreviated and normal
	foreach (int i in Enumerable.Range(0, 6))
	{
		Console.WriteLine(((long)Math.Pow(1024, i)).ToByteUnitString(true));
		Console.WriteLine(((long)Math.Pow(1024, i)).ToByteUnitString(false));
	}
}

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