Latest Windows changes non Windows HDD's to GPT

  1.    29 Apr 2018 #1

    Latest Windows changes non Windows HDD's to GPT


    Hi folks

    I'm running a Linux VM with 2 physical HDD's ( 2 X 3 TB ) formatted in XFS.

    Windows can't seem to leave these HDD's alone and they are all marked now as GPT.

    This means every time I start the VM I have to re-create my RAID 0 array (fortunately no re-format so no data loss) which consists of these 2 HDD's.

    This has only happened recently so I assume some Windows update must have caused this.

    Surely if it's a foreign File System Windows should leave them well alone !!!

    Annoying to have to do this at each power on of the VM.

    Running on latest (non 1803) build with all current updates applied.

    I know it's something Windows has done -- I used to get the message "Uninitialised Disks" if I went into control panel -->administrative tools--computer management--Disk Management which was fine

    now I simply get Healthy Primary partition. NOT CORRECT !!!!!

    The other HDD is fine (external 2TB also formatted XFS-- should be Unallocated not initialized --that's correct).

    Click image for larger version. 

Name:	gpt.png 
Views:	0 
Size:	88.4 KB 
ID:	186540


    Please Windows don't touch HDD's that you aren't meant to.

    Cheers
    jimbo
      My ComputerSystem Spec

  2.    29 Apr 2018 #2

    jimbo45 said: View Post
    Hi folks

    I'm running a Linux VM with 2 physical HDD's ( 2 X 3 TB ) formatted in XFS.

    Windows can't seem to leave these HDD's alone and they are all marked now as GPT.

    This means every time I start the VM I have to re-create my RAID 0 array (fortunately no re-format so no data loss) which consists of these 2 HDD's.

    This has only happened recently so I assume some Windows update must have caused this.

    Surely if it's a foreign File System Windows should leave them well alone !!!

    Annoying to have to do this at each power on of the VM.

    Running on latest (non 1803) build with all current updates applied.

    I know it's something Windows has done -- I used to get the message "Uninitialised Disks" if I went into control panel -->administrative tools--computer management--Disk Management which was fine

    now I simply get Healthy Primary partition. NOT CORRECT !!!!!

    The other HDD is fine (external 2TB also formatted XFS-- should be Unallocated not initialized --that's correct).

    Click image for larger version. 

Name:	gpt.png 
Views:	0 
Size:	88.4 KB 
ID:	186540


    Please Windows don't touch HDD's that you aren't meant to.

    Cheers
    jimbo
    I guess the reason it is doing it is as the drives are over 2.2 TB, for which Windows can only see 2.2 max if an mbr formatted drive, so automatically chooses gpt.
      My ComputerSystem Spec

  3. slicendice's Avatar
    Posts : 3,642
    Windows 10 Pro x64 v1809 Build 17763.134 (Branch: RS5 Release Preview)
       29 Apr 2018 #3

    cereberus said: View Post
    I guess the reason it is doing it is as the drives are over 2.2 TB, for which Windows can only see 2.2 max if an mbr formatted drive, so automatically chooses gpt.
    I agree. Since we are talking about VMs here, the host must understand the HDD before it can work with it.

    Are you running Hyper-V?
      My ComputersSystem Spec


 

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