What is the general speed of U disk transmission?

A, U disk structure

U disk's structure is relatively simple, mainly by the USB plug, the main control chip, voltage regulator IC (LDO), crystal oscillator, Flash (Flash), PCB board, SMD Resistor, capacitance, light-emitting diode (LED) and other components.

Second , u disk storage principle

In the understanding of the U disk transmission speed is generally how much before we look at the memory disk storage principle, U disk storage principle is the computer binary digital signal into a composite binary digital signal (add allocation, check, stack and other instructions) read and write to the USB chip adapter interface, Through the chip processing signal allocates to the EPROM2 memory chip corresponding address storage binary data, realizes the data storage.

EPROM2 data memory, its control principle is voltage control gate transistor voltage high-low value (high and low potential), gate transistor knot capacitor can hold the voltage value for a long time, which is why the USB power loss can save data after the reason. Can only be so popular and simple explanation.

　　Three, U disk working principle

U disk's basic working principle is also relatively simple: USB port is responsible for connecting the computer, is the data input or output channel; The main control chip responsible for the coordination of the components of the management and release of various action instructions, and the computer will be identified as "removable disk", is a U disk "brain"; Flash chip and computer memory in the principle of the same, is the entity to save data, the characteristics of the data will not be lost after power, long-term preservation; PCB Backplane is responsible for providing the corresponding processing data platform, and the components are connected together. When the USB disk is recognized by the operating system, the user gives the data access to the action instructions, USB Mobile storage disk work contains these several processing process.

　Four, u disk transmission speed is generally how much

U disk is divided into MLC Chip and SLC chip, the two read and write speed is different, compared to SLC faster, SLC read 9mb/s, write 8MB/S,MLC read 8mb/s, write only 2mb/s, but also consider the interface type, is 1.0, 2.0 or 3.0.

USB 1.0 Transfer Rate:

Low Speed low-speed 1.5mbps This travels very slowly.

Full Speed 12mbps = 1.5mb/s

USB 2.0 Transfer Rate:

High Speed high-speed 60mb/s

USB 3.0 transmission rate is said to be up to a few g per second, but small series is not used, I do not know whether it really reached such a fast speed, but these are only theoretical speed, generally in a few MB or 10MB, if less than 1MB is almost even slower, to see what is the reason.

　Five, U disk speed slow Solution

In understanding the U disk transmission speed is generally how much, we also have to know if a U disk transmission slow How to do, we said the U-boat speed slow, is usually said USB2.0 interface of u disk slow, in fact, to solve the U disk transmission speed is relatively easy to solve. All we need to do is replace the file system of the U disk with that of the computer. Then all 4K alignment, the speed will naturally be greatly improved before, the effect is very obvious, but the NTFS partition is a "log-style" file system, because to record the disk's detailed read and write operations, U disk This flash storage media will cause a greater burden, such as access to a file or directory, the NTFS system on the number of reads and writes more than FAT32, theoretically NTFS-style u disk is more easily damaged, so everyone in the choice of time must see their own needs.