The Solution to the Problem of USB Flash Drive
Generally, USB Flash Drive faults are divided into soft faults and hard faults, among which soft faults are the most common.
Soft failure mainly refers to the bad block in the USB Flash Drive, so that the U disk can be recognized by the computer, but no drive letter appears, or there is a drive letter, but when the USB Flash Drive is opened, it prompts to format, and the format cannot be performed. success. Early signs may include: U disk read and write slow, files are lost but still occupy space, etc. This kind of bad U disk can generally be repaired by software in low format. At present, the commonly used low format repair tool is Mformat (you can go to the Internet to search and download, it is extremely convenient to use, and it can be repaired in less than a minute). Of course, some USB Flash Drive manufacturers also Some similar software will be provided. The author thinks that since it is low format, the fault type is the same, the low format tool Lformat of the hard disk can also be used, but because Lformat runs under DOS, it is relatively troublesome, and the author has not tried it, so it is not recommended.
Hard failure mainly refers to the failure of the USB Flash Drive hardware. After inserting the U disk, the computer will find new hardware, but the drive letter cannot appear. When the U disk is disassembled, there is no burnout or other damage to the circuit board, and the method of applying soft failure is also unsolvable situation. (I had a U disk a long time ago, because the drive letter could not appear, I went to the after-sales service department for maintenance, because the author was also on the scene, I saw that they plugged it in for a long time, and I didn’t even try the soft repair. Fortunately, it also shows the ignorance of these people.) The hard fault is usually that the crystal oscillator of the fragile component in the U disk is damaged due to severe vibration. Replace the original crystal oscillator with a high-frequency crystal oscillator.
Next, we will explain the problem of file recovery in the bad U disk. U disk file recovery can only be recognized in the U disk in the soft failure, but the prompt requires formatting but the formatting cannot be successful. Readers can go to the Internet to download some file recovery software similar to EasyRecover, etc. The author has used this software to solve the file recovery of U disk and hard disk several times.
U disk (USB Flash Drive) data recovery mainly includes: various problems caused by abnormal unplugging (prompting to format, file loss), mistaken deletion, mistaken formatting, virus damage, physical bad sectors, etc., U disk (USB) The recovery rate depends on whether the USB flash drive (USB flash drive) is recognized. If the USB flash drive cannot be recognized, data recovery is very difficult. In other cases, the data recovery success rate of the USB flash drive (USB flash drive) is very high.
Common fault types of U disk (USB):
●Insert the U disk (USB flash drive), the drive letter will appear, but it is unable to open the disk, double-click the drive letter to prompt “Please insert the disk into the drive”
●Incorrect formatting
●Accidentally deleted
●Tips not formatted
●Do not recognize the disk
●CRC error
In the event of a data crisis, it is very important to maintain a calm attitude, otherwise rushing around is likely to cause even greater damage, which is irreversible. Before seeking help from a U disk (USB) data recovery service provider, we suggest that you try some conventional remedies by yourself. But all of this must be based on reasonable operations, otherwise it may cause secondary damage to the data.
U disk (USB) data recovery software:
The software usually used for general data recovery can simply perform the data recovery of U disk (USB flash drive), such as: easyrecovery, fianldata, recovery4all and so on.
How to restore U disk (USB) data:
The specific method of U disk (USB) data recovery will not be described in detail here. You can search for the conventional data recovery software mentioned above on the search engine, and refer to its specific usage for data recovery.
Common software downloads for U disk (USB) repair:
The commonly used software for U disk (USB) repair mainly includes: Mformat, Uformat, Usboot, etc. Please find the specific software download address on the Internet, and wish you good luck.
Maintenance experience of U disk (USB) data repair:
The following is a brief introduction to a technology that friends are very concerned about and difficult to learn. Many friends have asked us to understand the method of data recovery from U disk (USB flash drive). Meet the reference of maintenance personnel who do not have professional data recovery equipment: Many people have encountered customers who require data recovery, but they do not have a clear method. The following is an example of several specific methods for data recovery of U disk (USB flash drive) explain:
Case 1: A customer requested to restore the data of the U disk with a capacity of 256m, but when the customer brought the U disk into the computer, there was no response! Because it is very important to have cad drawings used in the project
1. Disassemble the U disk (USB) because it is packaged in one, and the customer requires only the data, so the shell does not need to be considered.
(1) Power supply: Check that the main power supply voltage of vcc is normal (vcc=3v power supply is the key voltage for whether the u disk works)
(2) Clock: By measuring the voltage of about 0.8v between the two pins of the clock crystal oscillator, it is preliminarily judged that the clock circuit is normal, and the crystal oscillator is replaced by the substitution method.
(3) Communication: Through the measurement of the above two points, it is preliminarily judged that the power supply and the clock are normal, the main check is whether the communication line is normal, and the line from the check sum d- to the main control is also normal!
(4) Through the measurement of the above points, it can be preliminarily judged that the working conditions of the main control are all satisfied, and the rest is the main control problem. I believe that everyone will replace the main control to achieve the purpose of data recovery, but we tell you from years of experience, it is wrong, because there is a control program in the main control chip of the u disk, when a new main control is replaced, the flash will not be performed. The identification and control must be initialized by the mass production tool, but this will destroy the data stored in the flash in a low-level format! According to our many years of experience, the main control damage is mostly due to the leakage of the internal dc-dc converter, which makes it not work due to the low internal power supply voltage of the main control. The solutions are as follows:
Remove the 3v voltage regulator tube of the u disk (USB), connect an external adjustable power supply to its 3v output terminal to adjust the voltage to 3v, and increase the voltage by 0.1v each time, when the u disk can be recognized normally Stop adding voltage, so that the data of the u disk can be read out. The principle is because the main control’s internal dc-dc converter leaks electricity, so that the normal vcc=3v voltage cannot meet the main control’s work. At this time, the power supply voltage can be adjusted artificially to compensate for the leakage loss! When I adjust the voltage to 3.4v, the computer can recognize it normally, and quickly copy and save the data in the u disk, 800 yuan is in hand, simple, huh, huh, technology is the first productivity!
Case 2: A customer brought a USB flash drive (USB flash drive), and there is an annual report of the factory inside. Because no one dared to take this job in many maintenance departments, the customer directly asked for 1,000 yuan and asked for the overall recovery of the data. u The phenomenon of the disk is that the disk can be recognized, but when it is opened, it prompts “Please format the U disk (USB)”! I believe that everyone feels very difficult for the second problem, because it can be completely judged that there is no problem with the hardware of the USB flash drive, most of which are software problems, but the USB flash drive cannot be formatted. What should I do? Specific solutions:
Our engineers first removed the flash of the U disk to protect the data, and re-installed a flash of the same type. After connecting to the computer, it still prompts that formatting is required. Since there is no data in the newly replaced flash, the data can be accessed normally after formatting. However, if you replace the flash with data, it will prompt you to format, so our method is to connect the U disk to the computer without flash, and the system prompts to format. After formatting the U disk itself, you can see that the capacity is 16kb in the properties. , Load the flash with data, connect to the computer, the system will format without prompting, and read the internal data smoothly! Repairing the above two points is the experience of engineers for many years. I hope it will be helpful to everyone. For members who want to learn to repair U disks, they can refer to the “Ultimate U disk repair ideas and methods” written some time ago. The success rate Can reach 100%! Practice has proved that the damage rate of the master control and flash of the u disk is really low!
