TB vs TiB
A terabyte is 10¹² bytes; a tebibyte is 2⁴⁰. That is why a new 4 TB disk shows as 3.6 TB. Convert any size below.
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Disk Space & RAID Calculator
The difference
1 TB1,000,000,000,000 bytes
1 TiB1,099,511,627,776 bytes
4 TB disk3.64 TiB
10 TB disk9.09 TiB
Nothing is missing: the same bytes are counted in a different unit.
RAID Levels and Units
Questions
Why does my 4 TB drive show 3.6 TB?
Your operating system counts in binary units (TiB) but labels them TB. 4 TB is 3.64 TiB.
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