Windows 10: how to convert D: with C: when in seperate disks?

i tried to delete partitions and try to get them adjacent and all that jazz but nothing works. whenever i delete D: and try to extend C: the Extend Volume is greyed out

:)

 

Cannot convert GPT to MBR.

Hi Michael,



I suggest you to follow the below steps and check if it helps.

This method you have to backup all your data and delete all partitions and volumes. Then use the
DISKPART command.

• Open command prompt and type in DISKPART and press Enter
• Then type in list disk (Note down the number of disk you want to convert to GPT)
• Then type in select disk number of disk
• Finally type in convert gpt.

Hope the information helps. Do reply if you need further assistance.

 

GPT disk conversion for both data drives and C drive


Macrium Rescue disk can be used to convert from MBR to GPT and vice versa without doing a fresh install of Windows.

1. Download Rescue6.1.1081X64.iso - Google Drive and use Rufus to create a bootable USB disk. Skip this step if you've already created the Macrium Rescue disk.
2. Download: BootEFI_Only-00-00.zip - Google Drive . Unzip to an external or an internal HD
   NOTE: This is a copy of the first 3 partitions of my current Windows 10 x64 (450MB Recovery, 100MB EFI and 16MB MSR)
3. Boot up Macrium Rescue disk and create a backup of your current Windows to another internal/external HD. It serves 2 purposes: you'd have a backup of your current Windows in case things go wrong and then use it to restore the C drive on the next steps.
4. Next, switch the BIOS to UEFI and use Macrium to restore the first 3 partitions downloaded in step 2 to your current MBR Windows. No need to convert or Format, Macrium will do it.
5. Again with Macrium, select the backup image from step 3, and copy back the C drive after the 3 partitions.
   After this step, you should have: 450MB, 100MB, 16MB and C drive (GPT partition scheme)
6. From Macrium, click on Fix the Windows Boot Problems
7. Reboot. Your Windows should be in UEFI mode.

 

Convert GPT Disk to MBR Disk in Windows 10


Recently I met an occasion where a Win10 installation on a GPT disk needed to be converted to MBR.
I think my experience may be of some help.

The target system was Win10 Enterprise, installed on an empty 300GB HD. The layout (as reported by "diskpart") was :
Code:

Code:

 Volume ###  Ltr  Label        Fs     Type        Size     Status     Info   ----------  ---  -----------  -----  ----------  -------  ---------  --------   Volume 1     C                NTFS   Partition    297 GB  Healthy    Boot   Volume 2         Recovery     NTFS   Partition    450 MB  Healthy    Hidden   Volume 3                      FAT32  Partition     99 MB  Healthy    System

Basically I followed "OPTION ONE" of Shawn Brink (the author of the original post).
Steps 1-3 were straightforward.
After clicking "Convert GPT Disk to MBR Disk" in Step 3, a warning poped out :





Click "OK" to dismiss, then proceed to Step 4.
After clicking "Apply", another warning appeared soon :





Click "Restart Now" to proceed.
The restart triggered the conversion before loading the OS.
When the conversion was completed (in just one or two minutes), the system was restarted again.
But this time it CRASHED : some error message saying OS not found.

This is normal, because the conversion tool did not mark the system partition as "bootable".
Now :

1. Boot the target system with the Win10 installation media (DVD/USB etc).
2. Select language & click the "Next" button.
3. Click the "Repair your computer" link.
4. Click the "Troubleshoot" square.
5. Click the "Command Prompt" square.
6. At the command prompt, invoke the "diskpart" tool.
   • Locate the target partition by using the "select" and "list" commands.
   • Execute the "select partition x" command, where x is the target partition number.
   • Execute the "active" command to mark it as "bootable".
   • "exit" the "diskpart" tool.
7. "exit" the command prompt.
8. Click the "Startup Repair" square. The system will restart after the repair.
9. Done.

After the fix, the layout of the target disk looked like :
Code:

Code:

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info    ----------  ---  -----------  -----  ----------  -------  ---------  --------    Volume 1                             Partition    450 MB  Healthy    Offline    Volume 2                             Partition     99 MB  Healthy    Offline    Volume 3     C                NTFS   Partition    297 GB  Healthy    System

Finally, a couple of remarks :

• The time required for the "Startup Repair" step varies on different systems. For the 300GB disk mentioned above, it was finished in less than a minute. On another case with 1TB HD, it took nearly 3 hours of heavy disk read-write to complete the operation.
• One downside of the method is worth notice : almost all of the functions in "Advanced startup" ("Start" -> "Settings" -> "Update & security" -> "Recovery" -> "Advanced startup") were gone after the conversion.