How to Resolve the USB Flash Drive No Response Problem

During data storage devices, USB flash drive is very important in transferring and storing data because USB flash drives are typically removable and rewritable, and physically much smaller than a floppy disk. If the USB flash drive has some problems, such as formatting, deleting, virus infection and other reasons, you can’t open and use USB flash drive, you probably loss the data storaged in it. If you are a Mac user, you can use this hard drive data recovery software (click here) to recover Mac data from Macintosh hard drive, iPod, USB drive, SD card, digital camera, mobile phone, MP3, and MP4 player due to deleting, formatting, virus infection, improper operation, unexpected power failure, and other unknown reasons. It can recover hard drive on Mac with high quality and save your precious time.
But sometimes it is not necessary to use a data recovery software, you can resolve the problem by yourself. When the USB flash drive errors happen, first to exclude normal damage to the USB interface and PCB Weld, and USB extension cable, and then repair by following guides.
1. USB flash disk doesn’t response to machine.
(1) power supply is divided into the main required to supply and FLASH needed to supply these two is the key, USB flash disk circuit is very simple, such as power supply are generally insurance inductance damage or 3.3 V voltage regulator block is damaged, it comes to the regulator block here, three-pin power input (5V), ground, power output (3.3), the working principle is that when the input pin input is a 5V voltage output pin will output a stable 3.3V. As long as you find out where the power stops, the problem will be solved well.

(2) Clock master in a certain frequency can work with FLASH communication but also the clock signal for transmission, so if the clock signal, the master will definitely not work. Circuit check this regard when, in fact, the clock generation circuit is very simple, only need to check the crystal and its peripheral circuits can be crystal afraid brush USB flash disk compact and very easy to fall to the ground causing crystal damage, as long as the replacement of the same crystal can. Note: The crystal oscillator can not be measured to determine the best way to good or bad is the substitution of a good crystal to determine.
(3) If the above two conditions are normal and that it is because the main chip is damaged, then you have to replace the master.
2. USB flash disk is inserted to computer, it says "unrecognized device".
Maintenance ideas: in this case, you can get the first note that USB flash disk circuit is normal, it is only the communication problem with computer. You should check out the following:
(1) USB flash disk interface circuit. The circuit without any special component is the two data lines D + D-, so check this circuit, as long as the measurement data line to the line between the master normal to, the general in the data two small resistor between the lines and the main control circuit connected in series, to play a role in protection, so you want to check whether these two resistor.

(2) Clock circuit. Due to the USB flash drive has to be consistent with computer, if the operating frequency of the USB flash disk and the computer can not sync, then the system will think this is an "unrecognized device". At this time we should change the crystal.
(3) The master. If the above two checks are normal, it can determine the master damaged. Prompt "Please insert the disk, the computer prompts:" Please insert a disk into drive H "prompt Format to open the USB flash disk which are garbled, capacity does not match.
Maintenance ideas: for this phenomenon can be judged that the USB flash disk hardware has no problem, it is just the software problems.
Solution: you need to find a repair tool to fix the master program. This is necessary depends on what program does the USB flash disk master uses.
USB flash the disk failure is probably the main problems. Other problems like can’t be written or storage any data, this is mainly due to the USB flash drive’s bad performance or bad blocks.
Go on reading: How to Recover Data on Mac?

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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