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External Hard drive shows up in Device Manager but not in Disk Management

By wlmchng ·
My external Hard drive shows up in Device Manager but not in Disk Management. It uses a usb cable with two usb heads on the end that plugs into the computer and one end that plugs into the drive itself. After I fooled around with a usb hub with the cable (basically, I tried plugging the cables of the usb hub and the hard drive in different ways) my hard drive is not detected anymore. When I plug it into my laptop, the little bubble on the bottom right pops up and says your new hardware is ready to use but then nothing happens.
Also, there used to be two lights that lit up (one green and one red)but now only the green light lights up. Can someone please help me?

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Both USB plugs MUST be connected directly ...

by OldER Mycroft In reply to External Hard drive shows ...

Neither of these plugs should be connected to a hub unless it is a powered hub (a hub that has its own mains power supply).

The hard drive comes with this specific cable due to the amount of current required to adequately connect the unit to both data and power. Connecting the usb plugs to a hub means further for the current to travel, and the further it travels the more likely it is to dissipate (get weaker).

You may also have the problem that your laptop is incapable of providing enough voltage via its usb sockets. If this is the case you would require the use of a powered hub to connect it to the external hard drive.

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See if this helps

by Jacky Howe In reply to External Hard drive shows ...

{1}
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Try rebooting the computer without any USB devices attached. Then plug in the USB drive, right click on My Computer, select manage, and then click ?Disk Management.? If the drive is not present in the Disk Management window or if you are not able to access it, then the drive may have failed. In this window you should see all of your connected physical drives, their format, if they are healthy, and the drive letter.
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Change the drive letter of the drive. Right-click on the drive in the list, and from the resulting menu select "Change Drive Letters and Paths"
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Click on Change so you can change the drive letter. Click Change. Select a new drive letter from the drop down list, preferably the one that is not normally used for this drive.
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Click Yes on the confirmation screen and you are done.
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{2}
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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.
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1. Login with Administrative privileges.
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2. Disconnect all USB or FireWire storage devices.
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3. Open Registry Editor by typing regedt32 in the Run box and navigate to the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
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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.
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5. Delete all possible USB drives, FireWire drives and external drives which have a drive letter.
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<b>DO NOT delete any of the fixed Hard Disk Drives or CD/DVD optical drives registry values.</b>
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Exclude \DosDevice\A: which normally reserved for floppy disk drives.
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{3}
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Click Start and in the Run box type in cmd and press Enter.
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At the command prompt type in chkdsk U:/r 'the drive letter that you just added:' EG: U: and press enter.
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If it finds any discrepancies it should fix them.
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Tip: The cause of unpredictable behavior in a USB drive is often found to be the incorrect removal of a previously connected USB device. When removing USB devices right click on the ?Safely Remove Hardware? icon in the menu bar tray. This is usually found in the bottom right hand corner of the monitor. Once you have clicked on the icon, a menu with a single selection should appear. Click again on that selection to see the ?Safely Remove Hardware? window. Select the correct USB device and click the ?Stop.? When you receive the message that it is safe to remove the device, unplug the USB device from the computer.
<br><br>
<i>Keep us informed as to your progress if you require further assistance.</i>
<br><br>
<i>If you think that any of the posts that have been made by all TR Members, have solved or contributed to solving the problem, please Mark them as <b>Helpful</b> so that others may benefit from the outcome.
</i>

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OMG!!! I finally fixed it!

by ledesmaj In reply to External Hard drive shows ...

I am the type of person that never asks the questions nor replies on technical forums. I selfishly input my question, find a response and if it works for me or not, I don't leave any feedback. Well not after today. I finally got it to recognize my WD 250gb HD in my computer and disk management after trying everthing. Here is what worked for me. I went to the products website(www.wdc.com)for Western Digital. Clicked the tab that reads Internet Hard Drives, then i clicked Internet Product List. Now on the top right corner in the search bar I typed my products name or whatever which is WD25BEVS. Now If you don't know what model u have check in device manager under disk drive, this is where i saw it. Ok after i typed the name in the search bar it found the product. I clicked search, the first result read WD Scorpio Blue 250 GB SATA Hard Drives ( WD2500BEVS ), so I clicked on it. when the page loaded I scrolled down and on the right side of the page there was a link called "downloads and software" click on it. now download "Data Lifeguard Diagnostic for Windows". Once you download and installed this run the diagnostics on the hd in question. This repaired the problem to were I was FINALLY able to see the HD in disk management. BUT WAIT THERE IS MORE!. Now go to download.com and download the free version of PARTION MAGIC. Install this and it will recognize your HD as unpartioned (I forgot to mention my HD was brand new, so it was unpartitioned). Now right click the partition in question and click create. then on the left hand side click apply. And this was the freaking trick! This finally made it pop up in my computer and everywhere else. I'm sorry if this reply is to long and discriptive, but I wrote it specifically for the novices out there as myself. Good luck.

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Your disk was raw

by Jacky Howe In reply to OMG!!! I finally fixed it ...

and wasn't partitioned. The OP had previously used the drive. As the OP didn't bother to reply to our suggestions we can only assume that the problem has been fixed.

Edit: forgot to add that your fix is a good one. I have had XP not recognise a raw disk disk before and I used gdisk to create a Partition so that I could then access the drive and manipulate the Partitions with XP.

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Right it was raw.

by ledesmaj In reply to Your disk was raw

Right from the box it was not being recognized by either explorer or Disk Management. I knew I had to create a partition so I downloaded Partition Magic, ran it, but the first 3 times I would create it would complete 100% then at the very end give me an error message. I searched the forums, no resolution. It was a day later that I finally visited the product site and found the Diagnostic for it. Thanks.

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External Hard drive shows up in Device Manager but not in Disk Mngmt_Fix

by Wasabi093 In reply to External Hard drive shows ...

With this problem I could not see the Portable HD in my computer nor could I see it in Disk Mangment. I could see it in device manager. Device mangr>properties said disk was running proper but did not show disk storage or info. So I hit the poplate button. I could then see the info about the space on the disk. However, it still wasn't reading the disk properly so after trying several other things. I left the disk plugged in and did the following:

Start>cmd (right-click, choose run as admin)>type: chkdsk (press enter)

When this was finished I could then see that the disk storage was then being seen by my pc. Then open Disk management: I could now see an additional disk listed as disk 1. There were 2 primary partitions showing but I could not do anything with either of these partitions. I had two choices, convert to dynamic which happened to not be supported by the disk or delete the pations. I chose to delete the partions. Then the following:

Right click on the Unalocated space>Chose simple volume>create a primary/ active partion>pick a drive letter like mnopqrstuv.....>boom you're back in business!

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