Differences between network bandwidth units and hard disk capacity units

When we are lazy, we will say that the network bandwidth is 10 MB. Do not assume that the maximum download traffic can reach 10 MB of files downloaded per second. It is actually 10/8 = 1.25 MB. The reason is that the bandwidth unit is different from the hard disk unit.

Misunderstanding: whether KB is equal to KB

I often encounter such a problem. If we clearly apply for a MB bandwidth optical fiber, but when I download software from a local website, the download speed can only reach 10 MB, the telecom department said that my network speed is very normal. Why?

Careful readers will surely find that the two data above me are in different units, one is MB and the other is MB. The specific difference is here. In our daily writing, we often do not pay attention to the above details. The true meanings of these two units are different. MB (all referred to as Mbps) is the unit used by the Telecom Department to measure network bandwidth. It means megabits per second (what is the meaning of M and K? I believe I don't need to explain it again ), MB (Mbytes) is the size of computer files in megabytes. We ignore this tiny difference when looking at the data, which leads to a misunderstanding of KB and kb.

Bandwidth unit details: in our memory, what we are most familiar with is that when modem was used to access the Internet, the access speed was only 56 kbps. In this unit, BPS is the abbreviation of bit per second. translating it into Chinese means bit per second, that is, the meaning of how many bits are transmitted in one second. So what is the relationship between bit and byte?

Storage Unit details: What we often hear is an 80 GB hard disk. G is the unit of hard disk capacity and storage unit. The minimum unit of storage is byte. For the storage unit, there are several units: GB, MB, and kb. The conversion relationship between the three is: 1 GB = 1024 MB, 1 MB = 1024kb, 1kb = 1024 bytes.

The relationship between kb and KB: We know in computer theory that the minimum storage unit of a computer is byte. one byte is composed of eight binary digits. Therefore, we can think that a byte is composed of eight digits, or that the space occupied by one byte and eight digits is the same. Because, when we use a 100 MB bandwidth network for download, the theoretical speed should be 12.5 divided by 8 equals MB.

Comment: after reading the above introduction, we will understand that the unit of network bandwidth and the unit of download are actually different. Therefore, we are readingTechnical materials, Or when writing, you must carefully read every detail.

1 mbps bandwidth, which is kb, that is, 16 64 KB
The disk size is 1 MB and 1024 bytes (1 m = 1024 K = 1024*1024 byte = 1024*8 bit)

Because the network transmission is first based on bit processing, it is still measured in bit, which is generally expressed in NN kb/s or NNMB/s, for example, the theoretical maximum transmission speed of the modem in V.90 is 6kb/s,
The disk is transmitted in parallel, which is first transmitted in bytes. Therefore, it is still measured in bytes, which is generally expressed in NNMB/s, for example, ultra SCSI is a 40 Mbit/s transmission speed.
Note: One is bit and the other is byte! Simply put, they are eight times different.