Why is 1 TB hard drive only 931 GB?

Many of my friends will find that the capacity will decrease when they buy a mobile hard drive and a USB flash drive inserted into the computer. Originally, the 16 gb usb flash drive would be less than 16 GB, and the 1 TB mobile hard drive would be only 931 GB. In fact, it is found that most of the time the capacity is insufficient on the Windows platform, if it is on Linux or Mac, it is the standard capacity.

Figure shows the capacity of 1 TB hard disk in uubuntu

The reason is that the IEC standard is used in windows. 1 GB = 1024 MB, 1 MB = 1024 kb, and 1 kb = bytes; in Linux, the SI standard 1 GB = 1000 MB, 1 MB = 1000kb, and 1 kb = 1000b is used.

You can calculate it as follows:

Under the SI standard (on Linux ):

1 TB = 10 ^ 3 GB = 10 ^ 6 MB = 10 ^ 9kb = 10 ^ 12B;

Under IEC Standard (on Windows ):

10 ^ 12B = 10 ^ 12/1024 kb = 10 ^ 12/1024 ^ 2 MB = 10 ^ 12/1024 ^ 3bg = 931.358853 GB

 

Perfect explanation !!!

For IEC and Si standards, see link: IEC Standard http://baike.baidu.com/view/1303868.htm? Fr = Aladdin

Standard SIB http://baike.baidu.com/subview/141102/5065502.htm#viewPageContent

 

Why is 1 TB hard drive only 931 GB?