Why is the actual capacity of the hard disk always less?

When you buy hard drives and memory, you will always find that the actual capacity of the hard drive is always a little less than theoretical. Today, the system home Xiaobian will solve the secrets for you. The first situation: Most brand machine manufacturers nowadays, considering the convenience of after-sales service and the user's needs, they all like to make a hidden partition on the hard disk. For example, a notebook is a typical example. The second case: the algorithm problem of the manufacturer. First of all, I would like to introduce you to the basic storage capacity unit knowledge. 1KB = 1,000 Byte1MB = 1,000 KB1GB = 1,000,000 KB1TB = 1,000,000,000 KB1KiB = 1,024Byte1MiB = 1,024KiB1GiB = 1,024MiB = 1,048,576 KiB1TiB = 1,024GiB = 1,073,741,824 KiB So, let's assume that the theoretical capacity of a hard disk is 500GB, then the manufacturer may choose 1KB. = 1,000 Byte algorithm, which is 500GB = 500,000 MB; and when the hard disk is installed on the computer, it will become 1KiB = 1,024Byte algorithm, which is 500,000 MB /1024 MiB = 488.28125 GB~ so everyone will see less hard disk So little space. - System Home's latest WinXP system, Win7 system download: http://www.xp85.com/html/list-104.html