Windows 10: Unable to assign drive letters after Win10 Upgrade

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  1.    04 Nov 2015 #1

    Unable to assign drive letters after Win10 Upgrade

    Hey everyone,

    This seems like a cool place with a lot of people that might be able to help me out.

    I tried the Windows 10 upgrade when it first came out and immediately went back to 8.1 when I couldn't get a single one of my internal SATA hard drives to mount.. I have 5 of them, and I just wasn't about to mess with that when 8.1 had no problems at all. Now I have tried it again and the same problem is happening. I want to see if I can figure it out this time. I am using the latest SATA and Chipset drivers for Win10 64 bit from Gigabyte's Website (I am using a Gigabyte Z77X-UD5H Rev. 1.1.

    I am "testing" Win10 using a bootable clone of my main SSD (that still has 8.1 on it) and I upgraded it to 10 just to mess with so I can figure out this ridiculous problem.

    My problem is that all of my internal SATA hard drives (with the exception of the system drive) cannot be assigned a drive letter in Disk Management. They show as healthy NTFS partitions but I get 1 of 2 different errors when I click on "Change Drive letters and Paths":

    1. "Virtual Disk Manager: The System cannot find the file specified."

    2 "Disk Management: The operation filed to complete because the Disk Management Console view is not up-to date. Refresh the view by using the refresh task. If the problem persists close the Disk Management console, then restart disk management or restart the computer" Hint: none of the recommended fixes in the error message change anything.

    I HAVE been able to assign the partitions a letter and mount them using a third party disk manager called "MiniTool Partition Wizard". It lets me mount the partitions and it works! ..However, if I restart the computer, I am back to square one and have to manually assign each drive letter for each partition every time.

    This is easily the worst experience I have ever had upgrading an OS, and one of the most mind boggling issues I have had with Windows in general. I really like Windows 10 and want to keep using it but half of my hard drives being un-mountable is a complete deal breaker right now.
      My ComputerSystem Spec

  2. topgundcp's Avatar
    Posts : 2,438
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       05 Nov 2015 #2

    Please post a screen shot of Disk Management and also the result of diskpart below.
    Open Admin command prompt and type:
    1. diskpart
    2. list disk
      My ComputerSystem Spec

  3.    05 Nov 2015 #3

    Here are the pictures. The drive that has no partition is one that I messed up while tinkering and trying to figure this out. Good thing its backed up.. haha.

    Also here is the link to the 3rd party software I was able to get the drives to mount temporarily (until restart)
    MiniTool Partition Wizard | Best partition magic alternative for Windows PC and Server
    Attached Thumbnails Attached Thumbnails 2015-11-05 00.08.11.jpg   2015-11-05 00.08.17.jpg   2015-11-05 00.08.21.jpg   2015-11-05 00.08.26.jpg  
      My ComputerSystem Spec

  4. topgundcp's Avatar
    Posts : 2,438
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       05 Nov 2015 #4

    I saw disk 1 and 4 are the same. Did you clone them ? Also noticed that you have efi system partition on disk 0, 1, 3 & 4. I assume disk 0 is your Windows 10 OS disk, am i correct ?

    Yes, I also have Mini tool and familiar with it.
      My ComputerSystem Spec

  5.    05 Nov 2015 #5

    Disk 0 is indeed the OS drive.

    1 and 4 are the same make/model/size of drive, but they are totally different partitions. 1 has sample libraries on it for virtual instruments, and the other has a bunch of my older Pro Tools sessions on it. The more drives, the merrier for Pro Audio work.

    I have often wondered why I need the EFI system partition on all of my data drives that don't have a boot loader for an OS or anything important... Can they be deleted? Could that be part of the problem? I much prefer alot of the 3rd party partition management software to the stock windows one, but I think most of these drives were likely formatted with the windows one. It also seems that the Windows one is "ground zero" for everything regarding assigning permanent drive letters. I have been working on getting all of my drives converted to GPT rather than MBR too.

    There are actually a few drives that aren't even plugged in right now.. (2 SSDs one with Mac OSX that I don't use much anymore and my main one with Win 8.1 aren't even hooked up while I mess with Win 10)

    Any ideas what might be causing so many issues with Windows Disk Management?

    - Sam
      My ComputerSystem Spec

  6. topgundcp's Avatar
    Posts : 2,438
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       05 Nov 2015 #6

    Let's work on disk 1 first. Did you make a backup on this disk ? If yes, can we wipe it out and re-initialize it ?
    FYI, with disk < 2GB in capacity, there's no need to convert it to GPT.
      My ComputerSystem Spec

  7.    05 Nov 2015 #7

    I would rather not wipe any of the disks that are in the screenshots. I have some other drives laying around that I could try and format to see if they can be assigned a permanent drive letter though. That is a good idea. It would at least rule out whether it is a SATA or Chipset driver issue.
      My ComputerSystem Spec

  8. topgundcp's Avatar
    Posts : 2,438
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       05 Nov 2015 #8

    OK. That's fine. If there's no OS on those disk then the EFI System partition should not be there. Yes, you can delete it, then assign a letter for partition 2.Open Admin command prompt, type:
    1. diskpart
    2. select disk 1
    3. select partition 1
    4. delete partition override
    5. select partition 2
    6. assign letter=Z
    7. exit

    If it works, do the same for other disks.
      My ComputerSystem Spec

  9.    05 Nov 2015 #9

    I tried the instructions you sent. Its the same error that was popping up in the GUI Disk Management.

    Both of the letters I tried were free/open letters to give a disk.

    The weirdness continues. I feel like I should install Windows 10 from scratch, but I don't have a DVD, or ISO to put on a USB flash drive for it.
    Attached Thumbnails Attached Thumbnails 2015-11-05 02.11.30.jpg  
      My ComputerSystem Spec

  10. topgundcp's Avatar
    Posts : 2,438
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       05 Nov 2015 #10

    On disk 1. Since you deleted the EFI System partition and now if you go back and list the partition, there's should be only 1 partition.
    1. diskpart
    2. select disk 1
    3. list partition ====> you will now have only one partition on disk 1
    4. select partition 1
    5. set id=07 override ====> To set the partition as basic data disk.
    6. assign letter=H ====> or any available letter.
    7. exit
      My ComputerSystem Spec

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