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Computer Store News Hard disk is an important part of storing data in personal computers. Its capacity determines the capacity of personal computer data storage. This is one of the first parameters that users should pay attention to when purchasing hard disks.

The unit capacity of the hard disk is megabytes (MB) or gigabytes (GB). The current mainstream hard disk capacity is 320 to 1500 GB. The factors affecting the capacity of the hard disk include the capacity of a single disk and the number of disks. Many people find that the capacity displayed on a computer tends to be smaller than the nominal value of the hard disk capacity due to different unit conversion relationships. We know that 1GB=1024MB in the computer, and the hard disk manufacturer usually converts according to 1GB=1000MB. The hard disk is an important part of the data stored in the personal computer, and its capacity determines the capacity of the personal computer's data storage capacity, which is one of the parameters that the user must pay attention to when purchasing the hard disk.

After purchasing a hard disk, careful people will find that the capacity of the hard disk in the operating system does not match the official nominal capacity, which is less than the nominal capacity. The larger the capacity, the greater the difference. The nominal 40GB hard drive shows only 38GB in the operating system; the 80GB hard drive has only 75GB; the 120GB hard drive has only 114GB. This is not caused by the manufacturer or the dealer to deceive the consumer by shoddy, but the hard disk manufacturer's calculation method of the capacity and the calculation method of the operating system are different, resulting from different unit conversion relationships.

As we all know, binary is used in the computer, so the calculation of the capacity in the operating system is in 1024, which is 1 KB per 1024 bytes, every 1024 KB. 1MB, 1GB per 1024MB; and hard disk manufacturers in terms of computing capacity is 1000 per 1000, 1KB per 1000 bytes, 1MB per 1000KB, 1GB per 1000MB, the difference between the two Caused the hard disk capacity & ldquo; shrinking & rdquo;.

Take the 120GB hard disk as an example:

Vendor capacity calculation method: 120GB=120,000MB=120,000,000KB=120,000,000,000 bytes Converted to operating system calculation method: 120,000,000,000 bytes /1024 = 117, 187, 500 KB /1024 = 114, 440.91796875MB = 114GB.

At the same time in the operating system, the hard disk must also be partitioned and formatted, so the system will also take up some space on the hard disk, which is provided to the system file, so it is displayed in the operating system. There will be differences between hard disk capacity and nominal capacity.