I need to convert the disk containing my operating system to a dynamic disk (from a basic disk). Unfortunately there is no room on the disk to convert the drive from basic to dynamic.

Microsoft documents the problem, and notes the solution is to delete the last partition on the disk:

Not Enough Space Available to Upgrade to a Dynamic Disk


Start Disk Manager, right-click the last partition, and then click Delete Partition.

Note: I don't need a reason to ask my question. But if anyone would refuse to answer the question unless i gave a justification, there one is.

enter image description here

It's important to note that:

  • this recovery partition didn't come from an OEM
  • the recovery partition was created when Windows 7 Retail was cleanly installed on the PC

Bonus Question: Why did Windows 7 create a "Recovery Partition"?
Bonus Question: How do you create, or re-create, a "Recovery Partition" on a hard drive that does not have one?

Fortunately i don't have to back anything up from this Recovery Partition, since Windows says it is empty:

enter image description here

Except the directions on Microsoft support don't work - there is no option to delete the recovery partition:

enter image description here

Microsoft says you can use the Create Recovery Drive to delete a recovery partition

From Create a USB recovery drive, which is used to create a USB recovery drive, there is supposed to be an option at the end of the wizard to delete the recovery partition on the hard drive:

When the process is done, do one of the following:

  • If you want to keep the recovery partition on your PC, tap or click Finish.

If you want to remove the recovery partition from your PC and free up disk space, tap or click Delete the recovery partition. Then tap or click Delete. This will free up the disk space used to store your recovery image. When the removal is done, tap or click Finish.


Some PCs don't offer the option to remove a recovery partition. If you experience this, there isn't a recovery partition on your PC that's using additional disc space.

When i complete the wizard, there isn't offered the option to remove a recovery partition:

enter image description here

Which apparently means that my machine doesn't have a Recovery Partition, yet i refer you to:

enter image description here

Which causes the questions:

  • do i have a Recovery Partition?
  • Why does Windows say that i do?
  • Why does Windows say that i don't?
  • Why did Windows create the Recovery Parition in the first place?
  • Why is the Recovery Partition empty?
  • Why does Windows not let a user delete a Recovery Partition?

The problem i'm actually trying to solve is how do i convert the disk to dynamic (without reinstalling Windows of course).


I tried using DiskPart from an elevated command prompt:

DISKPART> select disk 0
DISKPART> select partition 3
DISKPART> delete partition

Virtual Disk Service error:
Cannot delete a protected partition without the force protected parameter set.
  • The partition contains WinRE. This is the default behavior of the Windows installer. You can also use a different partition tool. The process of converting Basic to Dynamic, stuff can go wrong, so backup your data.
    – Ramhound
    Jan 9, 2016 at 1:02
  • 1
    Do you realize that that that disk is only 450 MB? You would have 111.60 GB instead of 111.25 GB for your C: drive. Hardly worth any effort.
    – Aganju
    Jan 9, 2016 at 1:29
  • 1
    And the reason people ask for your reason is not to make you justify yourself, but because understanding your reasons often helps to find another approach to a solution for your problem. So don't take it as affront, but as an indication that people are willing to fully understand your issue.
    – Aganju
    Jan 9, 2016 at 1:32
  • @Aganju Unfortunately i need the extra 500 kB.
    – Ian Boyd
    Jan 9, 2016 at 3:10
  • I thought you waned 450 MB not 500 KB?
    – Ramhound
    Jan 9, 2016 at 4:50

3 Answers 3


There is plenty of space on the disk. You are getting this error for a different reason. If your machine is anything but a desktop then you would get the error you have.


You aren't able to delete the recovery partition because it EFI protected. You should be able to force by using the override command.


I would try using diskpart (from an elevated command prompt) to delete the partition.

DISKPART> list disk
DISKPART> select disk 4

Disk 4 is now the selected disk.

DISKPART> list partition

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    Primary            223 GB  1024 KB
  Partition 3    Recovery           450 MB   223 GB
DISKPART> select partition 3

Partition 3 is now the selected partition.

DISKPART> list partition

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    Primary            223 GB  1024 KB
* Partition 3    Recovery           450 MB   223 GB
DISKPART> delete partition override

DiskPart successfully deleted the selected partition.

DISKPART> list partition

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    Primary            223 GB  1024 KB

After that you should be able to convert to dynamic disk.

Usually I re-purpose drives so I don't worry about data loss, but back up your data and use a desktop.

  • 1
    I used diskpart with the override command to force deletion of the Recovery Partition. I was then able to convert the disk to dynamic, and mirror it to another SSD as i desired. On the down-side, Windows blue-screened on the next boot because that partition was gone. Moral of the story: don't delete the recovery partition. Just wipe your disk and start over with a fresh install.
    – Ian Boyd
    Jan 11, 2016 at 20:49
  • 3
    Used diskpart to remove the recovery partition, but didn't experience boot issues like @IanBoyd Oct 8, 2016 at 13:28
  • 8
    Worked great on a drive that used to be a boot drive, but now is an extra drive.
    – BeaverProj
    Feb 2, 2017 at 1:58
  • 2
    Worked like a charm, thanks for sharing man! And especial thanks to @JeffAtwood for including the actual answer here on SU for us! Jun 25, 2017 at 5:03
  • 1
    @AnmolDeep diskpart can also do that too. techtarget.com/searchwindowsserver/tip/…
    – Kenttleton
    Feb 28 at 20:54

Option 1: Deleting a recovery partition using diskpart:

  1. Start menu, search for diskpart, right click, select open file location, right click on diskpart.exe and select Run as administrator.
  2. type list disk and press Enter, then select disk X (X is your disk containing your recovery drive ) and press Enter, then list partition, then select partition X (X is your recovery partition) and then delete partition override.
  3. If you get Delete is not allowed on the current boot, system, pagefile, crashdump or hibernation volume. Go to option 2

Option 2: Using a third party partition manager

Try something like EaseUS free partition manager. If the option to delete partition isn't in the context menu, go to option 3.

Option 3: using Disk Manager to shrink the recovery partition and merge the extra space with the main partition

This doesn't directly answer the question but provide a workaround to recover the space used by the recovery partition. Mine was taking 20GB (only 9GB used) and I could shrink it to 415MB.

  1. Go to Create and format hard drive partition(aka Disk Manager) and assigned a drive letter to the Recovery partition.
  2. In My Computer, open the recovery drive (if it's empty, go in Folder Options, and enable the option to show the hidden files and uncheck "Hide protected operating system..."). Delete the Dell folder (about 8.7GB).
  3. Go back Disk Manager, shrink the recovery partition to the minimum possible and increased the main OS partition over the released disk space and applied all changes.

(from mazyarjr)

If you can't shrink to most of the recovery size (I could only shrink to about 2GB even if there more than 19GB free), you will have to do it the hard way.

Option 4: using Ubuntu to shrink the recovery partition and merge the extra space with the main partition This option is much longer than the previous one. You need:


  1. In Ubuntu, open Gparted and then shrink the recovery drive and merge the extra space with the main partition. This step took about 3h.
  2. Reboot you computer, start windows: you will most likely have the error 0xc00000f or the error 0xc0000225.
  3. Restart you computer from the windows repair disk (or recovery drive): open Boot Options and then choose CD/DVD or USB, wait for it to load and then choose your keyboard language.
  4. You can try the option repair computer (I think it's in Troubleshooting and then Advanced options) but it didn't solve the problem for me. Instead open the command prompt and type this.

Don't forget to press Enter between each line:

bootrec /fixboot
bootrec /fixmbr
bootrec /rebuildbcd

If no windows installation is found do this (see warning below):

bcdedit /export C:\BCD_Backup
cd boot
attrib bcd -s -h -r
ren c:\boot\bcd bcd.old
bootrec /RebuildBcd

WARNING: The first time I reboot my computer (at step3), my recovery disk was assigned to the letter C and my windows disk to the letter F (you can know that if you enter diskpart in the command prompt from the repair disk). I didn't proceed with the last code I gave and instead I tried the fix #4 from here). I ended up with the An operating system wasn't found try disconnecting any drives that don't contain an operating system screen. I wasn't even able to get to the Grub to start Ubuntu so I started Ubuntu from the bootable USB. I use Ubuntu Boot Repair following all the indications it gave me. I got many error related to FlexNet and Wubi (I sort of ignored then, at this point, I was pretty sure I would have to use the windows system image). But when I restarted I was able to get to the Grub and to choose windows 10. I still got the 0xc0000225 error but this time, my windows disk had the letter C. I then entered the last code above and finally I could start Windows 10. Everything was normal in my windows user account.

If you had a dual boot, to restore Ubuntu Grub, follow this

Option 5: Deleting a recovery partition by reinstalling Windows: Make a backup of your files, use a bootable ubuntu usb drive to format and merge all the partition and then reinstall Windows. Windows creates a system files partition but that's only 500MB (nothing compared to the 20GB it used before).

Downside (that can be related or not to the option 4):

  • I can't anymore create a system repair disk as "the files needed are not found" (I created one without problem just before shrinking the recovery drive). I need to have a Window. ISO from which the necessary files are loaded.
  • I have lost all my restore points.
  • I don't know if there is a link but I tried to restore a restore point 2 months after deleting the Recovery Partition. I couldn't some files were missing. I had others bugs so I ended up reinstalling Windows 10 from scratch (cf option 5). I could get rid of the recovery partition. During the install,

Because, I upgraded from Window 7 to Windows 10 just a couple of days before doing option 4, after doing option 4, the boot displayed 2 versions of Windows: Windows 10 and 7. To remove Windows 7 from the boot menu, do this.


The easy way is to use a 3rd party disc tool I did it with the free version of MiniTool Partition Wizard (if you use it once you do select what you want done it looks like it is done in the interface, but you need to click apply - near top left of window - I suppose this is a fail safe or chance for a double check incase you do it to the wrong disc) There may be better tools, all I know is this one worked for me.

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