WinXP mobile hard disk can not show how to solve?

Under WinXP operating system, what should we do when our system hard disk is not enough? At this time, the mobile hard disk plays an important role. It is connected to the computer through the USB using a mobile hard disk, and is used as a local hard disk. However, some users have recently reported that the mobile hard disk cannot be displayed in the XP computer. It is impossible to have a mobile hard disk just bought. Looked at the icon in the lower right corner of the computer and it shows that it is connected. What is the problem? How to solve it? Here's how the WinXP mobile hard drive can't show how to solve it.

plug in the mobile hard disk, my computer - right click - Manage - Disk Management, there should be able to see your mobile hard disk, if the display is not divided, you only need to partition and format.

If you have partitioned, try the following method

to the system directory C:WINDOWSsystem32drivers to see if there is a sptd.sys file. Remove it and reboot.

Other solutions:

First, the auxiliary software repair method. Use "Super Magic Bunny", the advantage is that the operation is very simple: start the software & rarr; "advanced hide & rdquo; & rarquo; & ldquo; disk and folder", remove the U disk drive & ldquo; & radiquo; & rdquo; Click “Save” to restart the computer after exiting, the problem can be solved;

Second, modify the registry. “Start”→“Run”, enter regedit

Open the HKEY-CURRENT-USERSoftwareMicrosoftWindowsCurrentVersicnPoliciesExplorer branch, delete the NoDrives key, and close the registry to restart the computer.

If it doesn't work, try another socket and try again. If you can't, reinstall the USB driver and try it.

3, if the above methods can not be solved, it is caused by insufficient power supply.

You can try the USB port on the back of your computer.

If your computer is equipped with hardware such as an optical drive, floppy drive, or recorder, you can disconnect them from the power supply, which will reduce the power consumption. See if it can be displayed. If you can, change your power.

A: USB is not recognized by the computer. If it is the driver of the system or the system, it can be restored or booted after rebooting. Press F8 to enter the safe mode and exit. After entering the normal mode (repair damaged) Registry).

The U disk is inserted into the computer, and the computer prompts “Unrecognized device”. The troubleshooting method is as follows.

Step 1: If the USB flash drive is plugged into the computer, the computer prompts “Unrecognized device”, indicating that the power supply circuit of the USB flash drive is normal. Then check the USB interface circuit failure of the USB flash drive.

Step 2: If the USB interface of the USB flash drive is normal, the clock circuit may be faulty (the clock frequency of the USB flash drive and the computer cannot be synchronized). The crystal and resonant capacitors in the clock circuit are then detected.

Step 3: If the clock circuit is normal, the master chip is not working properly. Detect the power supply of the main control chip. If the power supply is normal, the main control chip is damaged and replaced.

There is another reason, that is, the power supply of the USB interface is insufficient, and there may be too many peripherals connected to the USB interface to cause insufficient power supply. It is recommended to use a powered USBHUB or a USB to PS/2 adapter. It is also possible that WinXP has enabled the power-saving mode by default, resulting in insufficient power supply to the USB interface, causing the USB interface to intermittently fail. Right-click on My Computer/Properties/Hardware/Device Manager and double-click on “Universal Serial Bus Controllers” to get to “USB

Double Hub”. Double-click any one to open the Properties dialog box. Switch to the “Power Management” tab, remove the “Allow the computer to turn off this device to save power” checkbox, click OK to return, and then click on each USB

RootHub property. Restart your computer afterwards. The USB device can resume stable operation, and the frequency should be set as low as possible.

If you need to install the driver, it is recommended to install the driver wizard 2008

, after installation, use its automatic update driver function, it will automatically download and install the latest version of the driver, including network card, sound card, graphics card, USB, etc., to avoid the pain of finding and installing.

Recommended Download: Driver Wizard

If there is a drive letter and it is not displayed, the solution is: right click on My Computer /Management /Storage /Disk Management, then right click "ld"; Move the disk”icon”Click the "Change drive and path" option in the shortcut menu and click “Add”press 捺, then select “ Assign drive letter” Select the appropriate drive letter from the drop-down list next to the option and click OK. Finally, open my computer and you will see the flash drive letter.

USB storage device is not recognized

When you want to use flash memory or mobile hard disk to exchange data with your computer, but when you plug in the USB port, you find that the system does not recognize the USB device. What is the cause? Here I will briefly explain the reasons for this phenomenon after troubleshooting the USB storage device itself.

1. The front USB cable is connected incorrectly. When the USB cable on the motherboard and the front USB interface on the chassis are connected to each other, this type of fault occurs when the positive and negative terminals are reversed. This is also quite dangerous because the positive and negative connection may cause the USB device to burn out.

2. The USB interface voltage is insufficient. When the mobile hard disk is connected to the front USB port, there is a possibility that the system cannot recognize the device failure. The reason is that the power of the mobile hard disk is relatively large, and the voltage is relatively strict. The front interface may not provide enough voltage. Of course, a poor quality power supply may also cause this problem. The solution is to not connect the mobile hard disk to the front USB port, replace the inferior low-power power supply or use the hard disk box of the external power supply if possible.

3. Motherboard and system compatibility issues. Hehe, the most famous of these faults is the compatibility of NF2 motherboard and USB. If you are experiencing this problem on the motherboard of NF2, you can install the latest nForce2 dedicated USB2.0 driver and patch, the latest motherboard patch and operating system patch, or try to refresh the BIOS of the motherboard. Can solve.

4. System or BIOS issues. When you disable USB in the BIOS or operating system, it will happen that the USB device cannot be recognized in the system. The solution is to turn on the options associated with the USB device.

Faulty performance of USB interface power supply:

1. The system cannot find the mobile hard disk, the status indicator of the mobile hard disk is not bright (green flash is read) or often green (red) For reading). It may be accompanied by a rhythm of the hard disk, "咔咔" sound, it seems that the hard disk is faulty.

2, the system can find new hardware, the driver for the new hardware is also installed properly, but there is no drive letter displayed in my computer, you can not use the mobile hard disk.

3, the system can hit the mobile hard disk, there is also a drive letter display, copy small files is normal, but it is easy to lose data when copying large files, causing the files copied to the mobile hard disk can not be opened.

4, the more serious is that after the host is connected to the mobile hard disk, the host can not start, prompting the system file is missing or the boot disk has no system files and other prompts.

The solution to the problem of insufficient power supply for mobile hard disk:

1. For the USB interface on the motherboard, there is a jumper that can change the power supply mode.

In normal use, we can try to change the power supply path, and change the original auxiliary power +5VSB power supply to the +5V power supply of the main power supply to see if the mobile hard disk can be used normally.

Note: The ATX V2.1 version of the switching power supply we usually use can only supply +5VSB1.5A. But in fact, most switching power supply manufacturers in order to reduce production costs in the production of switching power supply, for the +5VSB power supply, the low-voltage transformer is directly stepped down, and then supplied to the host through the 7805 voltage regulator block; some use single The tube self-excited switching power supply circuit has a separate 3-5W switching transformer to provide +12V DC voltage, and then is supplied to the host through the 7805 voltage regulation. The role of the secondary power supply in the host is mainly to provide the boot circuit, network wake-up, M wake-up, keyboard boot and other functions. Under normal circumstances, the current required by this part of the circuit for the secondary power supply is relatively small, so most hosts use this type of power supply will not produce what is the problem. Since the 7805 can output 1.5A current with the addition of a standard heat sink, most manufacturers do not use heat sinks or use small heat sinks during production, so the output of the radio waves is only 500MA at most, especially in the long time. When the current is working, because the 7805 generates a large amount of heat, the output current will decrease as the operating temperature rises, and the output will stop when the temperature is cut off. So when the USB interface of our motherboard is powered by +5VSB, we will use the mobile hard disk at this time, and it will definitely cause problems.

For a host that can only be powered by a secondary power supply, if this problem occurs, you can try to replace the high-power brand-name switching power supply for replacement.

2, the host is strictly limited by the supply current

Because the motherboard manufacturer to ensure the normal performance of the motherboard, the use of electronic circuits to ensure that the current output of each USB interface is 500MA, so When the mobile hard disk cannot be used, we can only replace the large-capacity and low-power 2.5" hard disk, or use a mobile device with an external power supply to ensure its normal use.

3, auxiliary power supply through other USB interface or PS/2 interface

Two USB interfaces under the keyboard and mouse, the power supply is the same as the keyboard and mouse, its PCB Most of the boards on the board are directly connected together, so when the mobile hard disk cannot be used, even if we plug in the PS/2 interface, the current increase will not change much, and the mobile hard disk will still be unusable most of the time. At the same time, it is possible to burn the interface and the control chip when the PS/2 interface is plugged in and out, which requires special attention. Under normal circumstances, the power supply of the USB hard disk is directly taken from the USB interface +5V. Note that some mobile hard disks will have two USB interfaces together, but the one on the side is not the data interface, but when the power supply of the main USB data interface is insufficient, in order to provide a larger current to ensure the normal operation of the mobile hard disk. Set up for work. But in fact, the power supply of the two rear or two front USB ports on the motherboard is taken from the same way, which means that the total supply current is limited to a certain range regardless of whether one or two USB devices are used. Especially, the performance of the power supply with poor power performance or low power of the host is more obvious. Therefore, when we encounter high-speed mobile hard disks using 40G or more, there are often cases where the power supply is insufficient and cannot be used normally. At this point, even if we connect two USB ports, it can't meet the power supply requirements of the hard disk, and it still can't be used. However, this situation can be used for 4 or 6 fronts, or 4 or more rear USB ports, because usually the USB interface is powered by a USB HOST. The HUB supports two USB interfaces. Group power supply, different sets of USB interfaces use different power supplies. Note that you must not connect to a set of USB ports.

4, using external power supply directly

For 3.5" mobile hard disk, because of its large operating current, so the mobile hard disk box supporting such hard disk uses an external power supply to provide Additional +12V and +5V power supply, so there is basically no electricity supply due to insufficient power supply. "Can find the mobile hard disk but in the case of <My Computer & rsquo; no drive letter display".

For mobile drives of more than 40G for 2.5“ because the working current is getting bigger and bigger, the +5V power supply of individual high-speed hard disks has reached 1A, so the working current of the hard disk can not be provided by relying solely on the USB interface. Meet the normal work of the hard disk. Most of the performances are: mobile hard disk can work normally on some machines, only some mobile hard disks can be found on some machines, but there is no drive letter display; some can sometimes read the disk on some machines, sometimes can not read the disk; copy Small files can work normally, but when copying large files such as movie music, data loss and loss of drive letter will occur. Therefore, it is recommended to provide an external power supply for the large-capacity 2.5" mobile hard disk to ensure the stable operation of the mobile hard disk.

The above is the WinXP mobile hard disk can not display how to solve all the content, if your mobile hard disk can not be displayed on the computer, you can follow the above steps to operate, you can help you one by one problem.