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Windows 7: External Hard Drive Not Detected

28 Apr 2011   #31
toglenn

win 7 Pro - 64 bit
 
 
Same Problem, Two Drives with Same Letter

I also had the same problem but was able to fix it. I discovered that my card reader had reserved drives even though they were not displayed in Windows 7 Explorer. In my case it was two drives with the letter L: (drive). After changing the external drive to N: drive the problem went away.

If you're running a card reader you might want to check which drives it has reserved.


My System SpecsSystem Spec
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29 Apr 2011   #32
Lestat54

Windows Home Premium 32bit
 
 

It was a faulty lead supplied with the hard drive, I tried everything else I could think of including the hints you and others had given me (and some other people who had the same problem) when I changed the USB lead the drive was recognised straight away and is now working superbly. Thanks to you and everyone else who tried to help me with this problem.
My System SpecsSystem Spec
16 May 2011   #33
CosmicSuperstar

Windows 7 Home Premium 64Bit
 
 
External Seagate Hard Drive not detected by Windows 7 64Bit

Hi there! I have a very strange problem lately. All of a sudden my external Seagate Hard Drive 320 GB SATA is NOT Showing up in the My Computer page. It was working fine earlier. I have checked the USB port which is working fine with my Pen Drive. Even the red light in the external hard drive is ON but it is not being detected by my computer. The drive was an internal laptop hard drive which was converted to an external hard drive by covering it with a Casing. It does not have any other power source input other than being connected to a laptop via a cable thru a USB port. It was working fine earlier. My system is a Dell Studio laptop 1558 64 Bit with Windows Home Premium installed. PLEASE HELP!!!

I went to the Properties of all USB Root Hubs/Generic USB Hubs and unchecked the Power Management option of "Allow the computer to turn off this device to save power". All drivers are up to date. Still it is not detecting the hard drive. I know the hard drive is fine because the light is on whenever I connect it to the USB port, also it was working perfectly earlier. Is a Windows update the culprit? Or could it be the Tweaking Softwares which tune up the Windows OS to speed up the system? What exactly is the issue here? And I can see that I am not the only one facing this problem with my Windows 7, half the world has the same problem! PLEASE HELP!!! ANYONE?
My System SpecsSystem Spec
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16 May 2011   #34
CosmicSuperstar

Windows 7 Home Premium 64Bit
 
 
Seagate external hard drive not being detected by the Dell laptop

Hi there! I have a very strange problem lately. All of a sudden my external Seagate Hard Drive 320 GB SATA is NOT Showing up in the My Computer page. It was working fine earlier. I have checked the USB port which is working fine with my Pen Drive. Even the red light in the external hard drive is ON but it is not being detected by my computer. The drive was an internal laptop hard drive which was converted to an external hard drive by covering it with a Casing. It does not have any other power source input other than being connected to a laptop via a cable thru a USB port. It was working fine earlier. My system is a Dell Studio laptop 1558 64 Bit with Windows Home Premium installed. PLEASE HELP!!!

I went to the Properties of all USB Root Hubs/Generic USB Hubs and unchecked the Power Management option of "Allow the computer to turn off this device to save power". All drivers are up to date. Still it is not detecting the hard drive. I know the hard drive is fine because the light is on whenever I connect it to the USB port, also it was working perfectly earlier. Is a Windows update the culprit? Or could it be the Tweaking Softwares which tune up the Windows OS to speed up the system? What exactly is the issue here? And I can see that I am not the only one facing this problem with my Windows 7, half the world has the same problem! PLEASE HELP!!! ANYONE?
My System SpecsSystem Spec
16 May 2011   #35
marsmimar

Microsoft Community Contributor Award Recipient

 
 

Hello CosmicSuperstar and welcome to Seven Forums.

I understand that the USB port is working when another device is plugged in ( a pen drive.) Have you tried plugging the external Seagate into a different USB port? If still no joy you might see if it somehow got changed to a "hidden device".

Device Manager : Hidden Devices
My System SpecsSystem Spec
16 May 2011   #36
CosmicSuperstar

Windows 7 Home Premium 64Bit
 
 

Hi Marsmimar,

Thanks for your reply. I tried the steps given in your Hidden Devices link, and changed the View Option of the Device Manager, but the External drive is still not showing up. It does not show up anywhere. The ports are all fine, the drive is also fine.....I suspect it is an issue of some windows setting or firmware. Still need help to solve this issue!
My System SpecsSystem Spec
16 May 2011   #37
marsmimar

Microsoft Community Contributor Award Recipient

 
 

Can you post a screenshot of your Disk Management so we can see how your hard drive(s) are set up? Leave the external Seagate plugged in when you open disk management. You can open the Start menu and type Disk Management into the search field, or type diskmgmt.msc (either one should open it.) Then you can use this tutorial on how to post a screenshot in Seven Forums.

Screenshots and Files - Upload and Post in Seven Forums
My System SpecsSystem Spec
16 May 2011   #38
CosmicSuperstar

Windows 7 Home Premium 64Bit
 
 

Trying to upload the screenshot


Attached Thumbnails
External Hard Drive Not Detected-untitled.png  
My System SpecsSystem Spec
16 May 2011   #39
CosmicSuperstar

Windows 7 Home Premium 64Bit
 
 

Here is the Disc Management screenshot


Attached Thumbnails
External Hard Drive Not Detected-untitled.png  
My System SpecsSystem Spec
16 May 2011   #40
marsmimar

Microsoft Community Contributor Award Recipient

 
 

This is a puzzler. I did some more digging and found this Seagate knowledge base article about troubleshooting an external hard drive that isn't being recognized. Perhaps it will shed some light on why your drive isn't being seen.

Troubleshooting a Seagate or Maxtor external hard drive that isn't found in Windows
My System SpecsSystem Spec
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 External Hard Drive Not Detected




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