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Can not recognize USB

By vanbinh.nguyen ·
my PC can not reconize my USB. on Disk Management, There are no USB disk. But
the USB is pluged in other PC, no problem.
Other USB is pluged in my PC, no problem.

Pls help me ?

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How about some technical details

by Deadly Ernest In reply to Can not recognize USB

Things like the operating systems being sued, are the devices USB 1 or USB 2 as these make a big difference.

A system with USB 1 drivers will NOT recognise a USB 2 device, while most USB 2 systems will recognise both. Some versions of Windows need special USB drivers loaded, some don't. Win 98 needs to have USB drivers for Win 98 loaded.

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See how you go with this

by Jacky Howe In reply to Can not recognize USB

1. Click Start, point to All Programs, point to Accessories, and then click Command Prompt.
2. At a command prompt, type the following command, and then press ENTER:
set devmgr_show_nonpresent_devices=1
3. Type the following command at the command prompt, and then press ENTER:
start devmgmt.msc
4. Troubleshoot the devices and drivers in Device Manager.

NOTE: Click Show hidden devices on the View menu in Device Managers before you can see devices that are not connected to the computer.
5. When you finish troubleshooting, close Device Manager.
6. Type exit at the command prompt.

Phantom Devices are icons that appear translucent or faded.

Delete all of the Phantom devices that are not connected to the computer. Check under Portable Devices and Universal Serial Bus controlers. Also uninstall the device if it is listed in under Portable Devices. Remove Unknown device as well.
Under Universal Serial Bus controlers remove all USB Universal Host Controlers.
Do the same under Storage Volumes leaving the exposed Generic volume. Restart the System and see if it is detected.


If it is now detected but it is not allocated a Drive letter try this.

Write down all fixed Disk and CD/DVD drive letters so as not to delete them. DO NOT delete any of the fixed hard disk drives or CD/DVD optical drives registry values.

1. Login with Administrative privileges.

2. Disconnect all USB or FireWire storage devices.

3. Open Registry Editor by typing regedt32 in the Run box and navigate to the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices. Right click on MountedDevices and select Export. Save this file as you may need it in case something goes wrong. Save it as Devices.reg, it should default to My Documents.

4. Under HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices there will be registry keys with the name that resembles the format of \DosDevice\X: where X can be any alphabet letter which corresponding to your physical system drive letter.

Edit: missed a bit

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Well assuming that this is a USB Enclosure with a HDD in it

by OH Smeg In reply to Can not recognize USB

And you are using Windows XP your only possible issue here is Power Related.

If this is a 2.5 Inch Enclosure meaning that it uses a NoteBook HDD and the HDD capacity is over 80 GIG you need to plug the Y Connector into 2 Different USB Ports to derive sufficient power for the HDD. Each USB port can supply up to 500 Milliamperes and this is not enough for HDD's over 80 GIG Capacity. Also the end USB Plug on a Y Cable is a Power Plug Only not a Power & Data Plug you need to use the one in the Middle for the Data & Power USB Plug.

If the External HDD is still not working you need either a Power Adapter if the Enclosure has provision for one of a Powered USB Hub and plug both USB Plugs into different ports of the Powered USB Hub.

If this is a 3.5 Inch Enclosure meaning that it uses a Desktop HDD you need to use the enclosed Power Adapted in a working Mains Socket.

If it's still not working try the above but I think you'll find that you do not have enough current to run this drive.

Col

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