The difference between KIB and MIB and KB and MB

original text ：KiB、MiB And KB、MB The difference between

First put an intuitive correspondence table ：

In decimal	In binary
1 KB = 1000 Bytes = 103 Bytes	1 KiB = 1024 Bytes = 210 Bytes
1 MB = 1000 KB = 106 Bytes	1 MiB = 1024 KiB = 220 Bytes
1 GB = 1000 MB = 109 Bytes	1 GiB = 1024 MiB = 230 Bytes
1 TB = 1000 GB = 1012 Bytes	1 TiB = 1024 GiB = 240 Bytes

In the international system of units TB、GB、MB、KB yes “1000 carry ” Number of numbers , For this reason, the International Electrotechnical Association （IEC） Made up "KiB"、“MiB”、“GiB" Binary units of , Special to mark “1024 carry ” The data size of . Although the base is different , but 1Byte = 8Bits It's the same . such as ：

• 1 KB ( KiloByte ) = 1000 Bytes = 8000 Bits
• 1 KiB ( KibiByte ) = 1024 Bytes = 8192 Bits

In daily use computers , Hard disk manufacturers are based on every 1000 It is a binary , Every time 1000 Bytes by 1KB, Every time 1000 KB by 1MB, Every time 1000 MB by 1GB, Every time 1000 GB by 1TB, The calculation of capacity in the operating system is based on 1024 Carry , And it has not been changed to "KiB"、“MiB”、“GiB" Binary units of .

So in the hard disk capacity of the computer ,1GB=10⁹/2³⁰≈0.93GiB, The operating system will think 1GB Only 0.93GB The capacity of , In fact, it should be 0.93GiB. Cause in the hard disk is “1000 carry ” Of 1G, Switch to the operating system “1024 carry ” Of 1G Become a phenomenon of insufficient numbers .