The capacity of the storage pool and volume is smaller than the nominal capacity of the hard disk?

[TMroy]

In order to facilitate production and calculation, hard disk manufacturers calculate the nominal capacity of hard disks on the market in decimal, such as 1KB=1000B, 1MB=1000KB, 1GB=1000MB, 1TB=1000GB, and so on. A 1TB hard drive is actually 1,000,000,000,000B.

The storage capacity calculated in the computer system is a binary calculation (2^10 = 1024), that is to say, 1KB=1024B, 1MB=1024KB, 1GB=1024MB, 1TB=1024GB, and so on.

When the hard disk is formatted by the system partition, the system will calculate the available capacity of the hard disk according to the binary system, then after converting from the decimal system to the binary system, 1TB (decimal system) = (1000GB x1000 x1000 x1000)/(1024 x 1024 x1024) = 931GB (binary).

It can be seen from this that after the decimal hard disk capacity is converted to binary, the displayed available capacity is obviously smaller, which is a normal phenomenon.