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Windows 7: Reassigning hard drive letters

15 May 2010   #1
bigonroad

Windows 7
 
 
Reassigning hard drive letters

My problem: My computer keeps failing to assign letters to two partitions. I can set it up fine in diskmgmt.msc, but as soon as I restart, it loses them again.


My setup: I have 2 hard disks.
  • Hard disk 1 has 3 partitions.
  • Hard disk 2 has 2 partitions.
However, the hard disk 2 partitions are not labelled or assigned a number automatically by windows. I can assign them one, but it resets when I restart the computer!

Background: I'm running Windows 7, which I installed yesterday. I've never had a problem like this before. Once assigned a letter, all the files are intact and accessible on the missing partitions.

An Image: Check the image below to see my setup in visual terms:



Any help would be much appreciated!
Bless,
Chris


My System SpecsSystem Spec
.
15 May 2010   #2
mitchell65

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

Hi Chris and welcome to the forum. What letters are you trying to assign? Are you using letters at the bottom end of the alphabet? If so try W,X or Y (I see you have used X)
My System SpecsSystem Spec
15 May 2010   #3
fishnbanjo

Vista 64 Ultimate, Windows 7 64 Ultimate, Ubuntu 9.10
 
 

Are the drives internal or USB/eSATA external drives? Windows 7 generally will not assign a drive letter on external drives in a lot of cases but once the user assigns a drive letter it should remain as the default. If the drive letter assigned is right when you boot into SAFE Mode then it may be some sort of software interference. You may want to review the Microsoft KB Article to see if it references your issue http://support.microsoft.com/kb/929135
My System SpecsSystem Spec
.

15 May 2010   #4
sygnus21

Windows 10 Pro
 
 

Quote   Quote: Originally Posted by fishnbanjo View Post
Windows 7 generally will not assign a drive letter on external drives in a lot of cases
Hi fishnbanjo,

Hmmm......Perhaps I'm missing what you're saying because Windows will assign drive letters to external drives. In fact I hadn't seen where it didn't happen, unless there was a problem.

I just now hooked up a thumb drive, an external hard drive, and WD Passport Drive. All the drive letters were automatically assigned by Windows.

Reassigning hard drive letters-external-drives.jpg


@ bigonroad,

Did you "manually" assign any drive letters?

Also, do this, try assigning a drive letter to just the "Photo" drive and see if it will stick. Let us know.


My System SpecsSystem Spec
15 May 2010   #5
Wishmaster

Windows 7 Home Premium 64bit
 
 

It should be assigning letters on its own, but i always thought Windows wanted them in certain order.
Meaning, the 1st partition of each drive gets 1st letter then moving to second partition on each drive assigning alphabetcally.

Such as :
Disk 0: P1(C) P2(E) P3 (G)
Disk 1: P1(D) P2(F)
CD ROM: (H) Or whatever letter you desire

I'm not certain this will make a difference, so please correct me if wrong.

This may not even be the cause, Just a thought.
My System SpecsSystem Spec
15 May 2010   #6
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

You have a very strange setup. Your Music partition is the Active partition containing the MBR. That's one of the first things I would fix. Has there been an OS previously on that partition?
My System SpecsSystem Spec
15 May 2010   #7
sygnus21

Windows 10 Pro
 
 

whs I noticed that as well. What I wanted him to try first was to see if he can assign a drive letter to his photo drive only. If he could, than the problem is not the hard drive but maybe the partitions. And if the music drive is the MBR he can't assign any other letter than what was assigned. Unfortunately he doesn't know what letter that was because it's blank.

That's my shot in the dark anyway.

But.... I had a different problem where I wanted to move my MBR from my "Games" drive to the "C" drive and SIW2 gave me a fix to do it. I think the OP should try and move the MBR first using SIW2's fix than see if he can assign drive letters.

Again, my shot in the dark.

Here's the post - Boot loader on separate partition?
My System SpecsSystem Spec
15 May 2010   #8
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

It could be a problem of hidden partitions. Go to this thread and have a look at my post #14. Look at the paragraph that starts with "Alternatively". Maybe you can unblock the situation with Partition Wizard as described. All links are in this thread.
My System SpecsSystem Spec
15 May 2010   #9
sygnus21

Windows 10 Pro
 
 

I guess we won't know until he posts back.
My System SpecsSystem Spec
15 May 2010   #10
SIW2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64
 
 

Boot into 7 - don't assign any letters.

In regedit , go to HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices

click on mounted devices and see what is listed under Dos devices in the right pane ( post a screenie )




Quote   Quote: Originally Posted by bigonroad View Post
My problem: My computer keeps failing to assign letters to two partitions. I can set it up fine in diskmgmt.msc, but as soon as I restart, it loses them again.


My setup: I have 2 hard disks.
  • Hard disk 1 has 3 partitions.
  • Hard disk 2 has 2 partitions.
However, the hard disk 2 partitions are not labelled or assigned a number automatically by windows. I can assign them one, but it resets when I restart the computer!

Background: I'm running Windows 7, which I installed yesterday. I've never had a problem like this before. Once assigned a letter, all the files are intact and accessible on the missing partitions.

An Image: Check the image below to see my setup in visual terms:



Any help would be much appreciated!
Bless,
Chris
My System SpecsSystem Spec
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 Reassigning hard drive letters




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