A tough day, again, perfectly solves the problem of unrecognized USB flash drives

Originally, we had a good plan yesterday. Who knows today that I don't know which kind of incense is not burning well, and my computer has encountered a very small problem. I 've been tossing around for the night before I recovered from other places, below is the flow account (eager to directly skip in the past, to the comment bar to grab a good, haha ).

In the morning, I was waiting for a sleep and suddenly woke up by a phone call. I picked it up in a confused manner. It turned out to be called by the department head. In the first sentence, I asked, "Do you have an invigilation this morning? ". When I heard this, I suddenly woke up, and my brain quickly scanned schedule to see if there was an invigilation in the morning. (if so, I forgot to go to invigilation, but it was a teaching accident, I can't afford it !), After confirmation, I immediately put my mind down. It was just a small thing that the department head called me and asked me if I had any PDF editing software. I have no other hobbies. I like to collect some good software and immediately recommend Adobe Acrobat 7 Professional. Since I fell asleep, I simply picked up the bedside book and remotely controlled the office machine to upload the software to the server in the department. And set a goal for the day, that is, to correct the final exam of the course "XML and application" some time ago.

Who knows? When I got to the office, I inserted the USB flash drive that saved the answers from the students into the USB port, but there was no familiar removable storage icon in my computer, instead, there is an unrecognized USB device warning box, and an unknown device (unknown device) appears in hardware management, rather than a familiar USB mass storage device. This has happened occasionally before. Just try again. So I re-inserted the USB flash drive and got the same error message. A hard-working plan suffered a small setback at the beginning, but it was still difficult for me to think about it. Since the USB flash disk cannot be identified on the front panel, it may be that the USB port is insufficient for power supply, so I inserted the USB flash disk to the plug-in behind the chassis. Who knows the same error. Is my USB flash drive broken? Maybe not. I have also selected a SanDisk. The quality of the products produced by major international factories should not be as good as that. How long has it been used? But I'm not afraid of 10 thousand. Just in case, I quickly took the USB flash drive to another host ...... The recognition was smooth and there was no problem at all. I finally put my half of my mind down, at least the USB flash disk itself is no problem. It's all about my courseware and all kinds of valuable materials over the past year. If it breaks down, it will be miserable, and I won't let the students take the test again because of the USB flash drive ...... That's really troublesome. Next, I will focus on my own machine ......

Division is used to detect computer problems. First, I have ruled out the problem of the USB flash disk itself. Then I need to check whether my USB flash drive is in conflict with the host. So I took another USB flash drive dedicated to the boot disk and tested it. The problem is still the same as that of the USB flash drive. I borrowed a mobile hard disk from my colleague ...... Still not good! USB flash drives do not work. Is there a problem with the USB interface? I connected the camera, USB shield, and other messy USB devices to the camera, but there was no problem. It seems that today's problem is somewhat evil. My computer not only treats my USB flash drive, but also has a cold eye on his brothers and sisters.

As a result, I started to make another effort (this sentence is so familiar with Nirvana ):

1. Entering security mode-useless.
2. Unmount all USB universal devices in the hardware manager and scan the new hardware to make the system install the driver automatically-useless.
3. Force the usbstor. inf driver to be installed on the unknown device-useless.
4. Modify the registry and delete the keys of related USB devices in CurrentControlSet.
5. Stop and restart the removable storage service.
6. Is it too gray? Clear USB interface-useless.
7. Changed the settings in BIOS-useless.
8. What is the inexplicable software installed these two days? Hurry up and restore the ghost ...... (I backed up a file a few days ago. It's enough)-Useless!

Day! I have no expectations for fixing this problem. Is it true that my USB interface is broken? Or worse, the USB control chip on the motherboard is broken ?! In the future, I will never be able to plug the USB flash drive into another machine, and then let people send me what I need over the network ...... Thinking of this, we are in the middle of the head, suddenly a flash of electricity --

I started it with a USB flash drive and recovered the ghost backup !!

Great news ...... It's a system problem. So with a cheerful mood (Narrator: Mao (first )~~ Illness ...... Go on tossing ing:

2. Back up all the files in the USB flash drive (I can't afford to lose a whole 1 GB) and format the USB flash drive-useless.
3. Go to the "Event Viewer" to see if there are any errors that have not been reported (this is so useful now !!).

   Suddenly, an error in the System Log inspired me:

   The parallel port driver service failed to start due to the following error:
   The service cannot be started because it is disabled or the associated device is not started.

   When I looked for a solution in the morning, I accidentally saw someone saying that this problem may be related to the parallel port problem, but I didn't care about it at the time. Isn't parallel port the legendary "Parallel Port" (it seems that learning e is useful )? Bright moment appeared in front of my eyes, I quickly Google this error, found a way in a pile of web pages (the following blue part reproduced from the "Information power" http://hi.baidu.com/eenew/blog/item/d20acc331b88ad43ad4b5faf.html):

   An error window pops up when the device is started, allowing you to view the event viewer. Find a Red Cross record: the parallel port driver service fails to start due to the following error: the service cannot be started because it has been disabled or the associated device has not started ." I don't know how to solve this problem. Search for it. The text is as follows: Some people say that they can turn this off by finding the system service, but I suspect that they have not personally practiced it because the system service cannot find the corresponding service. This error may occur because the parallel port has been disabled in bios, but there is a virtual parallel port in the system or software. To solve this problem, you only need to change "Start = 3" to "Start = 0" in the Registry HKEY_LOCAL_MACHINE \ SYSTEM \ controlset001 \ Services \ parport. (Bullfrog Note: The ControlSet is probably CurrentControlSet)

   The modification was just completed, and it was not too late to restart. A plug that accidentally touched the computer's wiring board. The plug is of poor quality and will be powered off upon a touch. This time is no exception ...... So my computer and the computer on the opposite side were instantly powered off. I had to crack my head in the eyes of the old lady ...... Miracle happened! After I enter windows, the USB flash drive indicator is always on. Even if I haven't clicked "my computer", I know that this USB flash drive will certainly work. Sure enough, all problems are just like the power of the past.

 

But I still don't understand at the end. Is it because the Registry has been modified? Is it because the voltage of the machine is more adequate after the power-off? Anyway, my machine is back to normal again. I can finally change my exam with confidence tomorrow!

Of course, I hope there will be no more problems tomorrow. Amitabha, God bless ......