how repair U flash disk

guclusat

Tanınmış Üye
Süper Moderatör
USB bellekler ile ilgili ingilizce bir yazı

General U disk failures are divided into soft and hard failures , the most common soft fault.
Soft fault mainly refers to the U disk has bad blocks, leading to U disk can be a computer to identify, but there is no drive letter appear, or have the drive letter appears, but when prompted to open U disk ,it need format, but format can not success. Early symptoms may have: U disk read and write slowly, the file is missing still take up space. This bad U disk can generally be repaired by software low grid current commonly used in low-cell repair tools Mformat (you can go online to search for downloads, using an extremely convenient and can be repaired less than a minute), of course, drive manufacturers are also a number of U will provide some similar software. I believe that since it is a low grid, fault type is the same, it should be the low grid tools Lformat drive can also be used, but because Lformat in dos run under relatively trouble, and I also did not specifically tried, it is not recommended.
Hard failures mainly refers to U disk hardware failure, plug in after-hours computer U will find new hardware, but the letter can not appear, open the U disk did not burn any circuit boards or other signs of damage, and the application of the methods of soft errors can not solve the situation. (I long ago there was a U disk, because the letter can not appear to after-sales service department overhaul, because I was also the scene to see if they inserted a long time, even the soft-fix did not test, saying it was impossible to repair, and directly to the exchange a piece, rejoicing over which also reveals the ignorance of these people.) hard disk failure is generally U fragile components inside the crystal damage due to severe vibration, and readers can try to spend less than a dollar to the electronic market to buy a replace the old with the frequency of the crystal oscillator.
U down to show the disk of the bad file recovery, U disk file recovery exists only in the soft fault in the U-disk can be identified, but was prompted to format the format can not be a success. Readers can go online to download some of the same EasyRecover file recovery software, such as, the author has applied several times to resolve this software U disk and hard drive file recovery.
The following failure in the maintenance, we should first rule out the USB port is damaged and the PCB board cold solder joint, and USB extension cable under normal circumstances, and then repair to judge.
1.U disc does not have any reaction to plug into the machine
Maintenance ideas: According to the fault phenomena judge, U disk machine did not work, U disk tools have to take the conditions that we maintain focus. U-disk whatever program you want to work must have the following conditions:
(1) power supply, is divided into master the necessary power required for power supply and FLASH, these two is the key, while the U drive circuit is very simple, if there is no electricity are generally damaged or 3.3V insurance inductance Regulators block is damaged, said regulator block and then say something here, too, which has three pins are the power input (5V), ground, power output (3.3), the working principle is that when a 5V input voltage input pin, the output pin will output a stable 3.3V. Found where there is no electricity so long as the root of the problem will be very well resolved.
(2) clock, because the master at a certain frequency to work, with the communication should * FLASH clock signal for transmission, so if there is no clock signal, the master will not work. Check this area in the circuit when, in fact, the clock generating circuit is very simple, only need to check the crystal and its peripheral circuits can be due to fear of brush and U crystal compact disc is easy to fall to the ground caused by crystal damage, as long as the replacement of the same The crystal can be. Note: The oscillator can not be measured to determine the best way of their good or bad is a good substitution to determine the crystal.
(3) The master, if the above two conditions are normal and that is the master chip damaged. As long as the replacement of the master. (Non-professional to make direct contact with manufacturers or waiver)
2.U disk into the computer, suggesting that "does not recognize the device."
Maintenance ideas: For this phenomenon, the first illustrates the circuit U disk normal, but only with the computer communications malfunction, and for communications to check the following points:
(1) U disk interface circuit, this circuit is that no special component two data lines D + D-, so check this circuit as long as the measurement data line to master the line between whether it is normal can be, generally in the data line and the control circuit will be between the two series with a small resistor values in order to play a role in protection, so to check the resistance of these two resistors are normal.
(2) clock circuitry, as U disk with a computer to communicate to be carried out at a certain frequency, if the U disk operating frequency and the computer does not sync, then the system will think that this is an "unrecognized device" had. At this time we should change the crystal. The actual maintenance of crystal damage really has a lot of examples!
(3) The master, if the above two checks are normal, it can determine the master damaged.
3, you can identify U disk, but when you are prompted to open the "disk not formatted" but the system is unable to format, or prompt "Please insert the disk" to open U disk which are garbled, capacity and itself does not match and so on.
Maintenance ideas: For this phenomenon, U disk itself can determine the hardware there is no problem, just a software problem with the.
Solution: find the master program repair tool and do some on it. This is necessary to everyone that looks at what U disk master is the program to a decision.
U disk failure who can not write files, do not store such phenomena are generally bad or FLASH performance caused by bad blocks. U disk unlike MP3, there is no firmware is said, but some manufacturers put their own software inside, it will not look at the low grid. To tell you a very simple method is to hit the master in the repair of damaged or can not find the appropriate tool, you can use U disk set to re-engage in a new U-disk, the methodology is the fault plane FLASH removed, the release to the new PCB board on it. U disk suite includes (PCB with a master (1.1/2.0) and shell set), maintenance is extremely easy to do data recovery even more convenient.
4, U disk card machine is always the case there
Maintenance ideas: try to change the format formats, such as the use FAT32 format it! Or low-volume grid U disk or disk U! In addition to the reasons for bad blocks, U disk and hard drives in use will appear as the file system errors lead to read and write speed is slow or can not read and write to a file, first use the system to scan the disk that comes with it, and scan to select "Automatically fix file system errors", U disk scan to see that there is no such folder:
find000
If there is a similar folder, delete it as you normally would use!
If not, try to use FAT32 formatted disks, or U
U-disk with the corresponding cell or low-volume production tool for U disk!
Note that pre-formatted disk to back up important data U!
Right-click the drive letter:
"Properties - Tools - Check Now" will begin the inspection of the letter!
Or:
Point "Start" - "Run", enter
chkdsk / f h:
Where / f is a parameter check - repair disk errors
h: is the drive letter you want to check your U drive what drive letter you what drive letter change!
5, U disk was blisters on the
Natural dry or hair dryer to dry cold wind files, U disk there is no circuit, bubble water, it should not be a bad moment.
 
Geri
Yukarı