Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: External Hard Drive no longer recognized

31 Jan 2014   #1

Windows 7 Home Premium x64
External Hard Drive no longer recognized

My HP Pavilion dv7-4065cx laptop no longer recognizes the external hard drive.

It worked fine until the internal drive died and I had to replace it.

The first time I hooked up the external drive after the new internal was up and running, a message appeared acknowledging the external drive and said that something needed changing to make it run faster. It also said that it would make the change in a few seconds unless I told it to stop.

Who doesn’t want a faster drive? I let it run.

Now I cannot access the drive at all.

It appears in “Device Manager” but not in “Computer.”

I have been searching and searching for an answer. I tried changing the drive letter from “H” to “G” but ended up with both “H” and “G” as its name.

There is probably a simple solution to this problem. However, with my luck, I might do something terribly wrong if I keep on fiddling around with this thing.

Any help would be appreciated.

My System SpecsSystem Spec

31 Jan 2014   #2

Windows 7 ultimate 64-bit

Have you checked to see if it shows up in device manager; and if it does; is there a ? mark or ! by it? Cause if that is the case; then that means there is either a driver issue and or a possible hardware issue. If not i would try updating the driver(s) for it; if it shows up in device manager.
My System SpecsSystem Spec
31 Jan 2014   #3

Windows 7 Home Premium x64

It shows up in DEVICE MANAGER with no question mark.

Checking the driver, I uninstalled and reinstalled the drivers. Upon completion, the message popped up asking if I wanted to Open Folder to View Using Windows Explorer’

I clicked and the message disappeared but I still cannot view the contents of the drive.
My System SpecsSystem Spec

01 Feb 2014   #4

windows 7 32 bit

same problem for me. buffalo 1 tb hard disk not showing in my computer. its showing in device manage. disk manager is not opening. what to do?
My System SpecsSystem Spec
01 Feb 2014   #5

x64 (6.1.7601) Win7_SP1 HomePrem

kcube: please open a new thread for the issue on your machine. It gets confusing when two people are trying to solve a similar issue in one thread.

My System SpecsSystem Spec
01 Feb 2014   #6

x64 (6.1.7601) Win7_SP1 HomePrem

Fred: I'm guessing the inital prompt you saw was for Readyboost.

Please follow this tutorial: Disk Management - Post a Screen Capture Image
I added a comment in post# 12 that explains what members want to see - the most information about the disks.

My System SpecsSystem Spec
14 Feb 2014   #7

Windows 7 Home Premium x64

I hope I have attached some screen shots that will get us started. (I don't see them)

Attached Thumbnails
External Hard Drive no longer recognized-device-manager-showing-wd750-working-properly.png   External Hard Drive no longer recognized-disk-management-top-half-screen-showing-drive-h-active-healthy.png   External Hard Drive no longer recognized-disk-management-bottom-half-screen-healthy-active.png   External Hard Drive no longer recognized-attempt-change-drive-letter-h-g-top-half-screen.png   External Hard Drive no longer recognized-attempt-change-drive-letter-h-g-bottom-half-screen.png  

My System SpecsSystem Spec
14 Feb 2014   #8
Microsoft MVP


Is Disk1 the new Hard drive you installed Windows 7 upon?

And is Disk0 the old Windows 7 HD which is no longer being used? If not then I would unplug it, swap its cable to the new HD so it becomes Disk0.

In the new Windows 7 install enable Automatically deliver drivers via Windows Update (Step 3),
check for Windows Updates, then install all Important and Optional Windows Updates to make sure you have all of your drivers and critical patches.

Now plug in the external and watch for activity in your System Tray. Does it install a driver? It needs the WD SES Device driver shown in error in the Device Manager picture above. It should load automatically once you have enabled for this and your system is fully updated and patched.
My System SpecsSystem Spec
15 Feb 2014   #9

Windows 7 Home Premium x64

Wow, Greg! That was a fast reply.

Yes, Disk 1 is the one on which C drive is installed. It is inside my laptop.

And yes, occupying Disk 0 is an backup drive I have used for years - it contains all of my old backup information that I refer to often. It is external and connected by an E-SATA cable.

I did not reconnect it to the laptop until about two weeks after I had installed and updated the new internal drive in the laptop. Shortly after reconnecting it, a message popped up asking if I wanted to make the external drive run faster. It gave me about 10 seconds to stop the process, or it was going to do it automatically. In that short countdown period, I thought “Why not - faster is better, isn’t it?

And that is when my trouble started. I never could access it after that.

Not being a computer whiz like you, I’ll have to think my way through what you just told several times before I will be brave enough to do it.

But, now, I do realize that the wrong disk is being called drive 0.

I’ll be out of town most of this weekend, but I’ll get to it ASAP.

I thank you for helping me on this. I feel sure that you have this problem already solved in your mind.

LA Fred
My System SpecsSystem Spec
15 Feb 2014   #10
Microsoft MVP


It looks like DISK0 once had a Windows 7 install on it. Nothing shows it is an external HD. It's rare one will show up in DISK0, which would be better to have as the OS. But that is determined by which port on the mobo the drive is plugged into.

But if DISK0 no longer has an OS then it should not be marked Active at all. So I would mark it Inactive at the minimum: Partition - Mark as Inactive - Windows 7 Forums

Even better would be to move the data off temporarily and wipe it with Diskpart Clean Command
to clear the external HD of boot code from the old install, then repartition it as a Logical drive: Partition / Extended : Logical Drives - Windows 7 Forums. As a Logical drive it cannot be marked Active or in any other way interfere with Windows 7 which makes it ideal for data.
My System SpecsSystem Spec

 External Hard Drive no longer recognized

Thread Tools

Similar help and support threads for2: External Hard Drive no longer recognized
Thread Forum
Solved External Hard Drive not recognized Hardware & Devices
Element external Hard drive no longer recognized by Win 7? Hardware & Devices
Partition on part of hard drive no longer recognized Hardware & Devices
Solved External Hard Drive no longer recognized Hardware & Devices
My External Hard Drive Isn't Recognized Hardware & Devices

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd

All times are GMT -5. The time now is 12:36 AM.
Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33