Unable to detect external harddisk [Solved/Closed]

Ask a question Dhanu - Last answered on Sep 16, 2014 at 11:12 AM by Quinley

Please solve my problem...

I have an external harddisk(WesternDigital) 200GB.
My PC is unable to detect it. Event I didn't found it in Device Management also.

What should I do? I need it urgent.

How can I know whether my USB is USB1.1 or 2.0?

please.. I have lot of important data in it.
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When you connect a new USB device to a computer that has no USB devices, Windows XP and Windows Server 2003 may not detect the new device.

To have us fix this problem for you, go to the “Fix it for me” section. If you'd rather fix this problem yourself, go to the “Let me fix it myself” section.
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Fix it for me
To fix this problem automatically, click the Fix this problem link. Then click R...
To fix this problem automatically, click the Fix this problem link. Then click Run in the File Download dialog box, and follow the steps in this wizard.

Fix this problem
Microsoft Fix it 50052

Note this wizard may be in English only; however, the automatic fix also works for other language versions of Windows.

NoteIf you are not on the computer that has the problem, you can save the automatic fix to a flash drive or a CD so that you can run it on the computer that has the problem.

To check whether this wizard resolved the problem, go to the "Did this fix the problem?" section.
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Let me fix it myself
This problem occurs when no device is connected to a USB port. That makes the US...
This problem occurs when no device is connected to a USB port. That makes the USB driver set the Open Host Controller Interface (OHCI) controller to a suspended state. When the OHCI controller is in a suspended state, it cannot always detect when you add a new USB device to your computer.
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To fix this problem on a Windows XP-based computer, you must be running Service Pack 1 (SP1) or later. To determine if you have Windows XP SP1 or later, click Start, click Run, type winver, and then click OK. If SP1 or later is not listed in the About Windows dialog box, then use Windows Update ( to install the latest service pack before you try to fix this problem.
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Steps to fix this problem
Create a new registry value that prevents an OHCI controller from entering a suspended state.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 ( ) How to back up and restore the registry in Windows
To create a new registry entry that will disable the Selective Suspend feature of the USB hub driver, follow these steps:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following key in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\USB
3. On the Edit menu, point to New, and then click DWORD.
4. Type DisableSelectiveSuspend, and then press ENTER.
5. On the Edit menu, click Modify.
6. Type 1, and then click OK.

Note This setting affects all USB host controller drivers in the system.

If the value of the DisableSelectiveSuspend registry entry is set to 1, the Selective Suspend feature is disabled. Additionally, the Allow the computer to turn off this device to save power check box does not appear on the Power Management tab for the USB Root Hub.
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Did this fix the problem?
To verify that the automatic fix worked, restart your computer. If the computer...

* To verify that the automatic fix worked, restart your computer. If the computer now recognizes the USB device, the problem is fixed, and you are finished with this article.
* If the problem is not resolved, you can also contact support ( .

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Microsoft has confirmed that this is a problem in the Microsoft products that ar...
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows XP Service Pack 1.
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For more information about USB problems in Windows XP or Windows Server 2003, c...
For more information about USB problems in Windows XP or Windows Server 2003, click the following article numbers to view the articles in the Microsoft Knowledge Base:
310575 ( ) Advanced troubleshooting tips for general USB problems in Windows XP
925196 ( ) A computer that is running Windows XP cannot detect a USB thumb drive, an Apple iPod, or an external hard disk drive
810090 ( ) Universal serial bus devices may not always be detected when you start or resume the computer in Windows 2000 or in Windows XP
892050 ( ) A USB device that is connected to a USB 2.0 hub is not detected in Windows XP Service Pack 2, Windows Server 2003 Service Pack 1, or Windows Server 2003 x64 versions
If these articles do not help you resolve the problem, or if you experience symptoms that differ from those that are described in this article, search the Microsoft Knowledge Base for more information. To search the Microsoft Knowledge Base, visit the following Microsoft Web site: (
Then, type the text of the error message that you receive, or type a description of the problem in the Search Support (KB) field.
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* Microsoft Windows XP Home Edition
* Microsoft Windows XP Professional
* Microsoft Windows Server 2003, Standard Edition (32-bit x86)
* Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)

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kbmsifixme kbfixme kbresolve kbbug kbenv kbfix kboswin2000fix kbui kbwinxpsp1fix KB314634
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zia- May 8, 2010 at 02:45 AM
i was trying to transfer some files from my laptop to the pc, using my external hard disk. when I connected the disk to the pc, it would not detect the disk. I even tried using different ports. it did not work. then I tried connecting it back to the laptop. but the laptop also did not detect it. I tried it on other pc's but it's the same. wht do I do now? I need the data on the disk.

note: when the disk is connected to any pc/laptop the light appears, indicating it is connected.

plz help
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In hard disk drives, firmware is the software code that controls, and is embedded in, the physical hard drive hardware.

Hard drive firmware is typically found on a flash memory chip on the hard drive PCB. Often the firmware will need to access various drive unique parameters from the hard disk platter surface during operation to ensure the correct functioning of the hard drive at all times.

The firmware controls all aspects of the internal hard drive operation -

When a hard drive is powered on, it is the firmware that is responsible for correctly configuring the hard drive and putting it in a ready state that will then allow the host PC to load the Operating System.
During the operation of the hard drive it is the firmware that ensures the correct operation of the hard drive, allowing it to correctly interact with other components on the system (eg. the operating system)
When the hard drive is powered down, a shutdown sequence is executed by the firmware that ensures the hard drive powers down correctly so that it will operate successfully the next time it is powered on.
So download the firmware of the harddisk.Or contact to vendor
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I guess it's important to re-iterate: check the connections. I replaced the nearly new usb cable and my external was recognized immediately-success!

Often we're primed to suspect software, but the easy checks should be done first
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try to use another port to connect the drive.
check if the cable is in good condition.
try to connect the drive in another computer to see if the problem remains.
if so is the case, then you may conclude that there is a problem with the drive itself.
bring the drive to where you bought it.
mars- Jun 24, 2009 at 10:55 PM
hi sashi I think its you anyway i'm not sure i'm too facing the same problem I have checked everything port,tried to recover but there is an error it doesn't even show in my disk manager just light blinks constantly no sound of usb while connecting just a safely remove logo.
misd- Apr 14, 2010 at 05:11 AM
the same problem with my WD 320GB HD...tried with replacing slots and cables but cannot detect....i use win 7...
Quinley 2Posts Tuesday September 16, 2014Registration date September 16, 2014 Last seen - Sep 16, 2014 at 11:12 AM
I have had to download current drivers on several occasions. Or you can check in your Device Manager. Update drivers from there, check to see if there is a question mark or yellow triangle over any of the devices or USB ports. If so, go from there. :) GL

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