Windows 10: New 1803 version created a new disk partition - Can I reclaim it?

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  1.    01 May 2018 #11

    What's actually happened:

    1803 added a driver letter to the partition. Slicendice is correct that these partitions have always existed, tucked away neatly in Disk Management, but for some reason, 1803 is adding a driver letter:

    Click image for larger version. 

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    Now it does...for no reason. Many users have reported this here. And here. And here. Besides the un-needed drive letter, it's also been given storage warnings. So for me, I get these every ~30 minutes:

    Click image for larger version. 

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    I imagine this issue will be more heavily reported on TenForums in the coming days and weeks, unless MS figures out what went wrong.

    What's the recommended fix here? I think removing the drive letter via DISKPART (as the first link ^^ shows) will solve both the File Explorer appearance and the storage warnings, right?
      My ComputerSystem Spec

  2.    01 May 2018 #12

    Yes, using the DISKPART commands will clear up the issue. FWIW, I went straight to MiniTool Partition Wizard (Free) when diskmgmt.msc came up short, and its right-click menu does the job just fine if you assign the offending partition a drive letter = "None". I'll blog about this issue and its frequent appearance tomorrow for Windows Enterprise Desktop. So far, it's showed up on only 1 of the 4 machines I've upgrade (1 more left to go, though).
    HTH,
    --Ed--
      My ComputersSystem Spec

  3.    01 May 2018 #13

    Thank you for the quick confirmation, Ed. I think a blog post will be quite helpful to many. It happened on 1 out of 2 systems that I updated to 1803.

    Yes, right-clicking wasn't helpful in Disk Management.

    MiniTool Partition Wizard looks quite handy. I ran DISKPART to save me the time, but I'll keep that bookmarked!
      My ComputerSystem Spec

  4. slicendice's Avatar
    Posts : 3,561
    Windows 10 Pro x64 v1809 Build 17763.104 (Branch: RS5 Release Preview)
       01 May 2018 #14

    ikjadoon said: View Post
    What's actually happened:

    1803 added a driver letter to the partition. Slicendice is correct that these partitions have always existed, tucked away neatly in Disk Management, but for some reason, 1803 is adding a driver letter:

    Click image for larger version. 

Name:	2018-05-01_12-01-07.png 
Views:	10 
Size:	406.5 KB 
ID:	186869

    Now it does...for no reason. Many users have reported this here. And here. And here. Besides the un-needed drive letter, it's also been given storage warnings. So for me, I get these every ~30 minutes:

    Click image for larger version. 

Name:	2018-05-01_11-58-29.png 
Views:	84 
Size:	54.9 KB 
ID:	186870

    I imagine this issue will be more heavily reported on TenForums in the coming days and weeks, unless MS figures out what went wrong.

    What's the recommended fix here? I think removing the drive letter via DISKPART (as the first link ^^ shows) will solve both the File Explorer appearance and the storage warnings, right?
    Yep, I have seen those reports too.

    Safest thing to do is to just un-assign the drive letter.

    This is how my EFI/GPT based system look like, which is following Windows recommendations:
    Click image for larger version. 

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    The MS "System Reserved" is missing for some reason, but normally that is also included. My recovery partition is also empty, but I could put WinRE or another custom recovery image there for easy repair.
      My ComputersSystem Spec

  5.    01 May 2018 #15

    It's an excellent tool: I blogged about it for Win10.Guru on April 17: Toolkit Item: MiniTool Partition Wizards (MTPW). Worth installing and getting to know.
    --Ed--
      My ComputersSystem Spec


  6. Posts : 132
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       01 May 2018 #16

    Can you please tell me if I have done OK?
    I unassigned the letter, but I also wiped it. I wasn't able to merge it to C drive.Click image for larger version. 

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      My ComputerSystem Spec

  7.    01 May 2018 #17

    Now what you can do with MiniTool Partition Wizard is move the FAT32 100 MB partition to the front of the drive. Then delete the 16MB (Other) partition. I've never had luck moving it. That is the Microsoft System Reserved (MSR) partition. If you want to recreate - make sure to apply the changes in MiniTool Partition Wizard and then exit it. Run the diskpart command. Then recreate the MSR partition using the command:
    select disk 0
    create partition MSR size=16
    exit
    exit

    Then you can go back into MiniTool Partition Wizard and move the front of C: drive to add the unallocated space to C: drive.

    NOTE: Disk 1 in MiniTool Partition Wizard is Disk 0 in diskpart!

    Code:
    Microsoft Windows [Version 10.0.17134.1]
    (c) 2018 Microsoft Corporation. All rights reserved.
    
    C:\WINDOWS\system32>diskpart
    
    Microsoft DiskPart version 10.0.17134.1
    
    Copyright (C) Microsoft Corporation.
    On computer: MAIN-DESKTOP
    
    DISKPART> select disk 0
    
    Disk 0 is now the selected disk.
    
    DISKPART> create partition MSR size=16
    
    DiskPart succeeded in creating the specified partition.
    
    DISKPART> exit
    
    Leaving DiskPart...
    
    C:\WINDOWS\system32>exit
    Click image for larger version. 

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ID:	186956
      My ComputerSystem Spec

  8.    01 May 2018 #18

    NavyLCDR said: View Post
    Now what you can do with MiniTool Partition Wizard is move the FAT32 100 MB partition to the front of the drive. Then delete the 16MB (Other) partition. I've never had luck moving it. That is the Microsoft System Reserved (MSR) partition. If you want to recreate - make sure to apply the changes in MiniTool Partition Wizard and then exit it. Run the diskpart command. Then recreate the MSR partition using the command:
    select disk 0
    create partition MSR size=16
    exit
    exit

    Then you can go back into MiniTool Partition Wizard and move the front of C: drive to add the unallocated space to C: drive.

    NOTE: Disk 1 in MiniTool Partition Wizard is Disk 0 in diskpart!

    Code:
    Microsoft Windows [Version 10.0.17134.1]
    (c) 2018 Microsoft Corporation. All rights reserved.
    
    C:\WINDOWS\system32>diskpart
    
    Microsoft DiskPart version 10.0.17134.1
    
    Copyright (C) Microsoft Corporation.
    On computer: MAIN-DESKTOP
    
    DISKPART> select disk 0
    
    Disk 0 is now the selected disk.
    
    DISKPART> create partition MSR size=16
    
    DiskPart succeeded in creating the specified partition.
    
    DISKPART> exit
    
    Leaving DiskPart...
    
    C:\WINDOWS\system32>exit
    Click image for larger version. 

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Views:	4 
Size:	155.8 KB 
ID:	186956
    You can move the MSR partition using Macrium Reflect. You basically make an image backup, then restore backup using drag and drop so the EFI, MSR and C drive are all next to each other leaving the unallocated space to the right of the C drive.

    However, a lot of work for very little gain.

    The MSR partition is a mystery, and it is not even needed for bitlocker in fact.
      My ComputerSystem Spec

  9.    01 May 2018 #19

    cereberus said: View Post
    The MSR partition is a mystery, and it is not even needed for bitlocker in fact.
    I've never seen a computer affected at all when it was missing.
      My ComputerSystem Spec


  10. Posts : 193
    Microsoft Windows 10 Pro 64-bit Version 1803
       02 May 2018 #20

    After 1803 update on this PC's Windows 10 Pro it created (disk 0 partition 3) never had this before on 1709.
    I update another PC same as this Windows 10 Pro & it only had System Reserve 549 MB & The C Drive partition.
    I did a disk cleanup & deleted all & no change.

    Click image for larger version. 

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      My ComputerSystem Spec


 
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