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Anonymous users2024-02-07The capacity of hard disks is in MB (megabytes) and GB (gigabits), the early hard disk capacity is low, mostly in MB (megabytes), in September 1956, IBM made the world's first disk storage system only 5MB, and now the rapid development of hard disk technology hundreds of GB capacity of hard disks have also entered the hands of home users. Hard drives are available in capacities of 40GB, 60GB, 80GB, 100GB, 120GB, 160GB, and 200GB, and hard drive technology continues to evolve, with larger capacities to come.
After buying a hard drive, careful people will find that the capacity of the hard disk in the operating system does not match the official nominal capacity, it is less than the nominal capacity, and the larger the capacity, the greater the difference. A hard drive with a nominal 40GB is only 38GB in the operating system; An 80GB hard drive is only 75GB; A 120GB hard drive is only 114GB. This is not caused by manufacturers or distributors deceiving consumers with shoddy products, but by the different calculation methods of hard disk manufacturers and operating systems, and by different unit conversion relationships.
As we all know, binary is used in computers, so that the calculation of capacity in the operating system is based on 1024 as a base, 1KB per 1024 bytes, 1MB per 1024KB, and 1GB per 1024MB; In terms of computing capacity, hard disk manufacturers use every 1000 as a base, 1KB per 1000 bytes, 1MB per 1000KB, and 1GB per 1000MB.
Take a 120GB hard drive as an example:
Manufacturer capacity calculation method: 120GB 120,000MB 120,000,000KB 120,000,000,000 bytes.
Converted to operating system, 120,000,000,000 bytes 1024 117,187,500kb 1024 114,.
The hard disk capacity can be calculated roughly as follows: 1000x1000x1000 1024 1024 1024 1024, and at the same time, in the operating system, the hard disk must also be partitioned and formatted, so that the system will also occupy some space on the hard disk and provide it to the system files, so there will be differences in the hard disk capacity and nominal capacity displayed in the operating system, and due to the different partition formats, the same hard disk in different systems The capacity is not exactly the same.
The same applies to USB flash drives.
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Anonymous users2024-02-06Normal, that's it.
The sum of 4 trays is about 480g.
Manufacturers generally calculate according to the decimal system, 1m = 1000 bytes. The computer is binary, and the tenth power of 1m = 2 is equal to 1024 bytes.
There is a difference between this calculation and the next round.
In addition, there may be hidden partitions, which are used for system restore and the like.
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Anonymous users2024-02-05It's normal, the calculation problem, and he doesn't calculate it by 1g = 1028mb.
I want you to ask this question.
First of all, you need to know how to look at the capacity of your hard drive. >>>More
Hard drive manufacturers calculate the space of the hard drive in kilodigits. >>>More
No, it's normal to have fewer partitions. All those who say 80G are about 78, and how many G they say are close to that, and you say that it is impossible to only have more than 50, only 1G 3G can be different, and each hard disk partition is different, but the difference is not big.
That should be the manufacturer hiding a part of the space, which is a backup of the system. You can use some tool disks to check before you enter the system. You can use PQ and other sub-drive tools to check it out.
1GB recognized by digital products such as computers and 1GB in industry. Computers and other digital products are strictly in accordance with the binary code to identify the capacity. Therefore, the relationship between KB, MB and GB is 1024 times higher for digital product recognition. >>>More