| Everyone that has used a PC or laptop will have used | | | | exists! If we were to transfer a single file of 5Gb on |
| this ports without themselves knowing. | | | | usb1.1 specs, on theory, we will need 3333s, which will |
| The history of the USB port goes back to the period | | | | take around 55min!! and 83s on a USB2.0 Specs. |
| of 1990s where several connection interface exist | | | | Over the years, different companies develop different |
| such as serial port, parallel port, ps2, etc. With so many | | | | interface for USB devices as well, which somehow |
| interfaces, a typical user will need different cables for | | | | defeats the purpose of standardizing a common |
| each separate connection. | | | | interface. However, the problem of different interface |
| USB (Universal Serial Bus) was created to standardize | | | | was not as serious as it was back in 1990s. |
| all the different interfaces, hence the word "universal" | | | | USB cable was able to carry power and to power up |
| With the standardization of different interface, the USB | | | | devices such as thumbdrive, webcams, external hard |
| port has more tasks to complete - to increase their | | | | disk, usb speakers, etc. However, power is capped at |
| transfer rate between the host and devices | | | | 5v, 100mA. |
| connected to it. | | | | USB cables suffer from a "useful" distance. Meaning, |
| USB started off on specification USB1.0 in 1994, | | | | the maximum length of a usb cable is capped at 5m. |
| followed by USB1.1, and finally USB2.0 in 2000. The | | | | Should the length be longer, the efficiency dropped and |
| various transfer speed of the specification is as | | | | data may be corrupted. |
| follows: | | | | For PCs with limited USB ports, a hub, typically with 4 |
| USB1.0 - 1.5Mbit/s USB1.1 - 12Mbit/s USB2.0 - 480Mbit/s | | | | additional ports, may be purchased. This will indirectly |
| As of writing, USB3.0 Specification was in the midst of | | | | increase 3 more ports on your computer. However, |
| discussion and the transfer speed is rumored to be at | | | | take note that the bandwidth and power of each port |
| 5000Mbit/s!! | | | | on the hub will be reduced, as all its bandwidth and |
| The increase in transfer speed was mainly meant for | | | | power are sourced from a USB port. |
| transferring of data between devices. As USB hard | | | | Common problems faced from using a hub, slower |
| disk expands in capacity, and users are demanding for | | | | transfer rate and the inability to power up external 2.5" |
| better video quality, naturally, video file sizes are | | | | hard disk as they require more power as compared to |
| increased. Thus the birth of USB3.0 | | | | a USB webcam or USB speaker. |
| The first commercial product released for USB flash | | | | That is all to wrap up for the topic and history for USB. |
| drives, commonly known as thumbdrive, in 2000. Back | | | | I hope that the above computer guide will assist you in |
| then, flash storage was at a measly 128mb. At time of | | | | having a further understanding of USB history. |
| writing, 2009, 1.5TB (1,500GB or 1,500,000MB) already | | | | |