3TB disk only 2.7TB

Why A 3TB disk is only 2.7TB and what is the future trend?  

Just bought a 3TB hard disk drive. However this 3TB disk is 2.72TB in size according to my computer. How do I “lose” 271 GB disk space?
You may not have noticed this when the storage was in mega bytes, because you only lost 5% at that time. You lose 10% in tera bytes age, you will “lose” more percentage when the size of storage increases in the future again.



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