General parameter explanation of U disk

Buy U disk when we generally have to understand the general parameters of U disk, in the end what are these parameters to explain? The following explanation:

1, write data transmission rate

U disk is dependent on the USB interface with the system, the speed of its interface limits the mobile hard disk data transmission rate. The current USB1.1 interface can provide 12Mbps; The USB 2.0 interface provides a 480mbps;ieee1394a interface to provide a 400mbps;ieee1394b rate of data transfer, but in practical applications for some objective reasons (such as the master chip used in storage devices, The production quality of the circuit board is excellent, etc., which slows down the transfer rate in the application.

2, storage capacity

Storage capacity is the maximum amount of data that the portable storage product can store and is the most critical parameter of a portable storage product. The general portable storage capacity of 1GB, 2GB, 4G, 8G, 16G, there are some more high-capacity products, but the price is more than the user can accept. 16MB of portable storage, has been basically eliminated by the market, and 8G products are the mainstream market, prices in the general user can accept the range, but also the manufacturers to launch the most type of product types; 64G products, because the price is expensive, the user group is few, the product kind also is few.

3. Data transmission Rate

The portable storage relies on the USB interface to connect with the system, and its interface speed limits the data transmission rate of the mobile hard disk. The current USB1.1 interface can provide 12Mbps; The USB 2.0 interface provides a 480mbps;ieee1394a interface to provide a 400mbps;ieee1394b rate of data transfer, but in practical applications for some objective reasons (such as the master chip used in storage devices, The production quality of the circuit board is excellent, etc., which slows down the transfer rate in the application.

4, interface

Interface type refers to the interface specification that is used by the portable storage product to connect to the computer system. The current portable storage products are basically connected with USB interface, and its interface specification determines the speed of transmission with the system. Where the USB1.1 interface can provide 12Mbps; The USB 2.0 interface can provide a 480Mbps data transfer rate. But these are the interface ideal state can achieve the maximum data transfer rate, in practical applications for some objective reasons (such as the storage device used by the main control chip, circuit board production quality is good, etc.), slowing the transmission rate in the application.

USB is the abbreviation of English Universal serial bus, the Chinese meaning is "universal serial buses". It is not a new bus standard, but an interface technology applied to the PC domain. USB was presented by a consortium of companies such as Intel, Compaq, IBM and Microsoft at the end of 1994. But until recently, it has been widely used. Since the release of the USB V0.7 version on November 11, 1994, the USB version has undergone many years of development and has now developed into 2.0 versions, becoming the standard extension interface in the current computer. At present, the main board is the use of USB1.1 and USB2.0, the USB version can be very good compatibility. The USB1.1 interface can provide 12Mbps; The USB 2.0 interface provides the maximum transmission speed of 480Mbps. USB with a 4-pin plug as a standard plug, in the form of daisy chain can connect all the peripherals, can connect up to 127 external devices, and will not lose bandwidth.

USB2.0 specifications evolved from the USB1.1 specification, the original goal is to USB1.1 transmission number (12mbps) to increase 10~20 times, but actually increased by 40 times times, reached 480Mbps, converted to MB for 60mb/s. USB2.0 and USB1.1 can be compatible, that is to say, USB2.0 devices can work on USB1.1 interfaces, whereas USB1.1 devices can work on USB2.0 interfaces. Of course, the speed of the USB1.1 device will not be enhanced by the installation on the USB2.0 interface, and the speed of the USB2.0 device installed on the USB1.1 interface will also be limited to 12Mbps (1.5MB/S). USB2.0 and USB1.1 Use the same connection cables and ports.

USB requires support from three aspects of host hardware, operating system, and peripherals to work. and USB interface can also be a special USB connecting machine to achieve dual-computer interconnection, and can expand through the hub more interfaces. USB has fast transmission speed, easy to use, support hot plug, flexible connection, independent power supply and other advantages.