I am going to write a little bit about this basic concept in storage: Gigabyte (GB) and Gibibyte (GiB). This is all because of the annoyance between standard and reality.

I can still remember 15 years ago, when I first got in touch with enterprise storage system, the first concept introduced is about the differences between physical disk labelled size and reported size in storage system. No need to calculate, even today, I can still clearly remember a 73GB SAS disk will report 66GB usable capacity in EMC CLARiiON, a large part of this difference is contributed by the difference between GB and GiB.

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