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1k = 1 kilo = 10**3
1ki = 1 kibi = 2**10
1M = 1 mega = 10**6
1Mi = 1 mebi = 2**20
1G = 1 giga = 10**9
1Gi = 1 gbbi = 2**30
1T = 1 tera = 10**12
1Ti = 1 tebi= 2**40

Please. When you mean 16*2**30 bytes, don't write 16GB, but 16GiB.

https://en.wikipedia.org/wiki/Binary_prefix