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Windows 7: Not recognising USB HDD,s

02 Mar 2015   #1
grasmith

Win 7 home premium x64
 
 
Not recognising USB HDD,s

Hi all.

As of a few days ago, computer not recognising plugged in USB hard drives.
Have to assign drive letter via Disk Management to access the drive.
I don't understand why this should suddenly occur. I am not aware of anything untoward happening that results in this very annoying glitch.
Ideas most welcome.

Thanks in advance.


My System SpecsSystem Spec
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02 Mar 2015   #2
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Here's some ideas:

Use another cable

Use another USB port

Run the drive manufacturer's diagnostic tool

Not sure what drivers USB drives use, but you might try to remove any drivers in Device Manager and then do a new install as if you just bought the thing.
My System SpecsSystem Spec
02 Mar 2015   #3
grasmith

Win 7 home premium x64
 
 

Hi.
Should have been more coherent. The drive does show in Disk Management but drive letter is not assigned and therefore it is not accessible in win explorer for example, until drive letter is assigned. This happens with all my USB drives regardless of port used.
My System SpecsSystem Spec
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02 Mar 2015   #4
jumanji

Windows 7 Home Premium 32 bit
 
 

Your early morning worksheet.

Plug out all USB HDDs.

Start > All Programs > Accessories > Right click on Command Prompt and Run as administrator.
Then
diskpart [ENTER]
Against the DISKPART prompt
automount [ENTER]
Does it say "automatic mounting of new volumes disabled" ? Then
automount enable [ENTER]
"automatic mounting of new volumes enabled"

Close Command Window.

Now plug-in your ext. HDDs

Problem resolved??? Post report.
My System SpecsSystem Spec
02 Mar 2015   #5
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

@jumanji

Would it be helpful after following your instructions to reboot?
My System SpecsSystem Spec
02 Mar 2015   #6
jumanji

Windows 7 Home Premium 32 bit
 
 

Usually we always recommend to reboot after doing any alteration. Some do not require a reboot.. I do not remember whether a reboot is required in this case. I have to run it and check. You may also disable and then enable and check. Thanks for bringing this out . To make sure, the OP may reboot and then plug in his HDDs.
My System SpecsSystem Spec
03 Mar 2015   #7
grasmith

Win 7 home premium x64
 
 

Jumanji.

Followed your instructions and indeed auto mounting was disabled.
All external HDD's now have drive letters attached.
I would like to know why auto mounting was disabled, but I suppose that's Windows for you.

Thanks a lot.
My System SpecsSystem Spec
03 Mar 2015   #8
jumanji

Windows 7 Home Premium 32 bit
 
 

Quote   Quote: Originally Posted by grasmith View Post
Jumanji....I would like to know why auto mounting was disabled, but I suppose that's Windows for you.....
Neither men nor machines are 100% perfect.

Some random event had caused the registry value HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MountMgr\NoAutoMount to change
from 0 to 1 . We just reversed it.

What that event was in your case is hard to guess.

In Nov 2014, when Lady Fitzgerald was setting up her new Lenovo laptop, she had the same problem. Considering that it was a brand new laptop, it is even harder to guess.

Anyway, I have added your question to the "100 things to do research" list, but I don't know when I will do it. I am not perfect either.
My System SpecsSystem Spec
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 Not recognising USB HDD,s




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