Mobile hard disk can not recognize the general situation is the mobile hard disk plug in the USB, the computer can not recognize, and the mobile hard disk has been "Da da" rang, this is typical of the phenomenon can not identify removable hard disk, how to solve this problem? Hopefully this article will solve your mobile hard drive identification problem.
The reason why a system or system is driven by itself
First, the USB is not recognized by the computer, if the system or system with the driving reasons, you can repair the following method.
1, the boot press F8 into Safe mode after the exit, select Restart or shutdown in the boot, you can enter the normal mode (repair the registry).
2, if the failure is still, please use the system with the System Restore, restore to you did not appear this time of failure repair (if normal mode recovery failure, please turn on the F8 into Safe mode to use System Restore).
3, if the failure is still, using system disk repair, open a command prompt input Sfc/scannow return (SFC and/between a space), insert the original system disk repair system, the system will be automatically compared to repair.
4, if the failure is still, set the optical drive in the BIOS for the first boot device Insert system installation disk press R to select "Repair Installation" can be.
5, if the failure is still, it is recommended to reload the operating system.
Second, set the CMOS parameters
For a friend who has never used a USB add-in, it is possible that the system cannot detect a USB hard drive even if the driver is properly installed, mainly because the default CMOS port on the motherboard is turned off, and if it is not set to open, Then Windows naturally cannot detect the removable hard drive. To solve this problem, we can reboot, enter the CMOS Setup window, and in the "Pnp/pci CONFIGURATION" column, "Assign IRQ for USB" is set to "Enable", This allows the system to assign an available interrupt address to the USB port.
Third, the power supply is insufficient
Because the USB hard disk in the work also need to consume a certain amount of electricity, if directly through the USB interface to take electricity, it is likely to appear power supply. There may be too many peripherals attached to the USB interface to cause insufficient power. It is recommended that you use a live Usbhub or a PS/2 adapter using a USB switch. It is also possible that Windows XP by default to open the power-saving mode, resulting in insufficient USB interface, so that the USB interface intermittent failure. Right-click My Computer/Properties/hardware/Device Manager, double-click the Universal serial Bus controller to several "USB Root Hub" to double-click on any one, open the Properties dialog box, switch to the Power Management tab, remove the "allow the computer to turn off this device to save power" before the check, click OK to return, Restart the computer after you have modified the properties of each USB Roothub in turn. USB device can restore stable operation, the frequency as low as possible.
Four, USB extension cord failure
In addition to the above two reasons, it is possible that the USB interface type does not match the removable hard drive. For example, the computer configured USB interface is 1.1 standard, and the purchase of the mobile hard disk is the USB 2.0 standard interface, which requires connecting the computer and mobile hard drive connector must support the USB 2.0 standard. Because a high-speed mobile device is plugged into a low-speed hub, the device may not be installed properly, and some friends use a USB drive while using a mobile hard disk, which makes it easy to use the 1.1 standard connector that comes with the USB 2.0 standard, which results in the correct identification of the mobile hard drive. This failure can be resolved simply by replacing the connector with the USB 2.0 standard.
V. Windows version is too low
For some friends who are still using Windows 95 or Windows 97 systems, even if the computer is equipped with a USB interface, because the operating system before Windows 98 does not support USB peripherals, install the driver anyway, Setting the CMOS parameters does not allow the removable hard drive to work properly. One workaround for this situation is to upgrade the operating system to Windows 98, and the other way is to download the appropriate patch at Microsoft's official site to allow Windows 95/97 to recognize the removable hard drive.
Six, the letter does not show
If there is a letter but not shown, workaround: Right-click My Computer/management/storage/Disk Management, then right-click the removable disk icon click the Change Drive and Path option on the shortcut menu and click the Add button in the subsequent interface, and then select Assign drive letter. Also, select the appropriate letter from the Drop-down list next to the option, and click OK. When I finally open my computer, I can see the drive letter of the removable hard disk.
Vii. improper setup of the system
For some Windows 98 users, after the driver is installed, you can view the removable hard drive from Device Manager, but there is no corresponding letter ID in the resource Manager, which is the result of improper system setup. Double-click the hard drive in Device Manager and click on the pop-up window of the "Properties" button, you can see the disconnect, removable, synchronized data transfer and INT 13 unit four options, which "can be deleted" in front of the system default is not ticked, as long as the option to restart the computer, You can see the new mobile hard drive letter in the resource manager.
Word, the mobile hard disk can not identify the cause of the failure is more, but generally not USB interface or the fault of the mobile hard disk itself, so need to be excluded when more from the surrounding related part of the consideration