How many bytes are in 1 GB?

Q) How many bytes are in 1 GB?
We could approximate that 1 Gigabyte has 1 billion bytes, but the correct answer is  2^30 bytes.

How can I remember this answer in the future? Well here is one trick to always remember this.  Please read how to build the following table:

1. Starting with 1 byte = 2^0 bytes, make a table multiplying the previous row by 2, or just annotate the next power of 2:   2^0, 2^1, 2^2, 2^3, etc.
2. Once you reach 2^10 bytes, you can call it  1 KB (which is not 1,000, but 1024 bytes) 
3. For 2^10 to 2^19, the table mirrors the first 10 rows, except for we add the unit K (Kilo). So 2^10 B is 1 KB, 2^11 B is 2 KB, 2^12 B is 4 KB, and so forth.
4. Once you reach 2^20 bytes, you can call it  1 MB (which is not precisely 1million bytes, but 1024^2 bytes)
5. The rule #3 is analog for 2^20 to 2^29,  2^30 to 2^39, etc. So 2^25 B [= 2^(20+ 5) B] is 2^5 MB or  32 MB and 2^37 [= 2^(30+ 7) B] is 2^7 MB 128 GB.

Decimal (Bytes)	Digital Storage (Bytes)
2^0	1
2^1	2
2^2	4
2^3	8
2^4	16
2^5	32
2^6	64
2^7	128
2^8	256
2^9	512
2^10	1 K (1024)
2^11	2 K
2^12	4 K
...	...
2^20	1 M (1024^2)
2^21	2 M
...	...
2^30	1 G (1024^3)
2^40	1 T