Posts Tagged ‘Usb 2 0’

Christopher Liu asked:




The basic criteria determining the choice of a USB flash drive.

The size and weight of the flash drive are the first criteria to consider. Its essence lies in its small size and light weight. Designed to fit the key chain, some models have attachment pad or ring and can easily be dipped in your pocket. Real objects in the trend, the USB key are placed in the same rank as mobile phones. They come in all shapes and colors. In short, the design of these materials develops daily. The choice is varied, depending on taste. Technically, the range of variation in the capacity of USB drives on the market is quite wide, ranging from 256 MB to 16 GB. Because of its popularity in most cases, the USB key must be robust. The USB can twist over time. So, before purchasing you should always check if it is securely attached to the remainder of the key. Sport models are also available with the shell padded shock proof.

The first technical criteria determining the choice of the USB.
Speed is essential for a quality USB key, because despite high storage capacity, some USB sticks are too slow for data transfer. It is advisable to choose a 2.0 High Speed USB for high transfer speeds (approximately equal to 10 MB per second), not to be confused with the USB 2.0 that it is not as fast. Also with the High Speed USB, the port to which the key will be connected must support USB 2.0 High Speed transfer rate, otherwise how fast it is, but it would not be optimal. Besides the need for a computer to have the option of a USB port, the key should also be compatible with the operating system. For newer operating systems like Windows 7, Vista, XP, 2000 and the latest Linux, recognizing the USB is not a problem. The problem lies in machines with outdated operating systems like Windows 98 or Windows Me. With earlier operating system, the installation of drivers is needed for the USB key to be recognized by the machine. In this case, it is best to change the operating system or download the driver software for the USB key on the site of its manufacturer, as most USB drives on the market are not accompanied with drivers CD.

To choose your USB key

For a complete satisfaction after buying a USB key, determine in advance the storage capacity according to the criteria of uses that you anticipate. For carrying office files, a key having a capacity of 16 MB to 64 MB is already more than sufficient as compared to what is offered by a 1.44 MB floppy. For storage of certain programs such as MP3 or a light video, you need to look for a key having a capacity greater than 128 MB, fortunately, actually there are some models can store up to the capacity of 32 GB

Prior to purchase, you have also to determine the operation interface of the USB key. The question is whether it is a USB 1.0 or USB 2.0. The older version, that is to say 1.0, although slower, it can easily perform data transfer of low capacity, but while the larger the data being transferred the more the transfer time is extended. For example, to transfer 256 MB on a given USB 1.0, it will take 4 minutes and 15 seconds or 255 seconds, whereas with a USB 2.0, it will just take 37 seconds or 6 times faster. In general, the maximum output of USB 1.0 transfer is 1 MB per second and against 7 MB per second for USB 2.0. Moreover, there is not a huge difference in the cost between these two. For compatibility, if all USB function without driver installation on machines running Windows 7, Vista, XP and others, it is not the same for those on Windows 98, which require installation to operate. In this case, always check the installation CD that comes in the packaging of the key or it can be downloaded. For those who use the ancestor Windows 95, forget the use of a USB key unless you change operating system.

The latest generation of USB flash drives comes with U3 technology, which allows the use of certain software compatible directly on the USB. As a result, installation of software is no longer necessary. Everything is done on the key. A mobile office is now at your fingertips.