A program that lists all available storage plans

StoragePlans.cs

using System;

long n = 8;
for (int i = 0; i < 60; i++)
{
    var storage = n << i;
    Console.WriteLine($"{storage.Amount()} {storage.Unit()}");
}

static class Extensions
{
    private static ReadOnlySpan<char[]> sizes => new[] 
    { 
        new[] { 'M', 'B' },
        new[] { 'G', 'B' },
        new[] { 'T', 'B' },
        new[] { 'P', 'B' },
        new[] { 'E', 'B' },
        new[] { 'Z', 'B' },
        new[] { 'Y', 'B' }
    };
    
    private static int Mag(this long value)
        => (int)Math.Log(value, 1024);
    
    public static string Unit(this long value) =>
        String.Create(sizes[value.Mag()].Length, sizes[value.Mag()], (chars, buf) =>
        {
            for (int i = 0; i < chars.Length; i++)
            {
                chars[i] = buf[i];
            }
        });
    
    public static long Amount(this long value) =>
        value.Mag() switch
        {
            1 => value / 1024,
            var x when x > 1 => value / (1024L << ((value.Mag() - 1) * 10)),
            _ => value
        };
}

/* Output
8 MB
16 MB
32 MB
64 MB
128 MB
256 MB
512 MB
1 GB
2 GB
4 GB
8 GB
...
*/