How do I undo a dual boot?

I have a machine running win 8.1. I used Keith Mayer's instructions to setup dual boot with server 2012 R2 core with Gui. I would like to undo this and return to single boot. I have tried to run Diskpart and find the Vdisk and detach it. The system
says there is no Vdisk to detach. I can select it. but not undo it. Suggestions? How do I undo the BCDboot? or how can I replace the OS image that is being referenced?

Hi Floyd Kershner,
You also can refer the following related KB:
How to delete Windows 8 in dual systems
https://support.microsoft.com/en-us/kb/2844463/en-us?wa=wsignin1.0
I’m glad to be of help to you!
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Similar Messages

How to install Arch for dual-boot with Win 7 (on 2 hard drives)?

Hello,
the TLDR first: how exactly should I proceed when setting up GRUB for 2 hard drives to dual-boot Arch (64 bit)and Win 7 (64 bit)?
Long version: So, I have the following hard drive & partition layout:
On my first hard drive (250 GB big) I have: Win 7 64 bit, all the programs for Windows and of course the EFI partition
My second hard drive is 1 TB big and formatted in NTFS and it only contains data. It has 2 partitions, one is about 750 GB big and used for simple storage.
Sidenote 1: sometimes my disk management (Windows' own gparted) shows either the little disk or the big one as disk 0. Don't know what exactly this means, but I have never ever experienced any problems whatsoever during use.
Sidenote 2: the UEFI motherboard (ASRock H67M) cannot boot into Legacy mode.
I want to install Arch on a ~200 GB partition on the second hard drive (the one with 1 TB). (click here if you want to see a screenshot) I am posting this because I am confused with how exactly I should deal with the whole "2 hdds & UEFI" thing.
So how exactly should I proceed when setting up GRUB for this setup?
For partitioning I suppose I would have to use fdisk or cgdisk. I used cgdisk before and found it to be straightforward. Then, because I have experienced my fair share of problems with rEFInd, I'd like to use GRUB.
Last edited by jones (2013-06-29 14:36:56)

First thing you should do is become familiar with your motherboard.
http://www.asrock.com/mb/manual.asp?Model=H67M
This will probably help you out in understanding the sidenote 1 thingie (hdd's on sata3 and/or sata2 connectors)
As on sidenote 2, according to the manual it seems to be possible to boot legacy mode, see Storage Configuration.

How to set time in Dual-boot config with Windows 8.1

Hi,
I have been trying to workaround this problem i am having with Arch linux and Windows 8.1 time settings.
According to Installation guide on Wiki I set hardware clock to UTC and added my local time zone too.
But my Windows 8.1 uses hardware clock a local time and it is really confusing me.
I did tried to setup Windows 8.1 to use UTC (http://superuser.com/questions/494432/f … bios-clock)
but that settings is not working on my side (most Windows 8.1 users are also getting the same problem)
Please help.

I have two laptops which are dual booted arch and Windows 8.1. For both of those machines I set the Windows clock to be UTC instead of local using the method in https://wiki.archlinux.org/index.php/Ti … in_Windows (i.e. creating the .reg file and executing it - take care that the .reg file is created correctly with the .reg extension or it won't execute). I still allow Windows 8.1 to update its time from the network and it does not cause a problem, though the advice is to let Arch do the time synchronisation. (That may be because it is not yet summertime so I will also disable time sync in Windows before the change to summertime at the end of this month). I also followed the normal install advice for Arch and have the hardware clock in UTC, and have chrony set up to keep time in sync. Additionally I use KDE and have my normal timezone with DST adjustments for summertime. I have not had any problem with that way of working on either of my two machines.
I presume that if the Windows clock registry hack is done after the dual boot install it should not matter but I made that change before installing Arch.
Last edited by mcloaked (2014-03-21 10:46:04)

How to setup GRUB for dual booting OS X and arch?

So I am reading the wiki, and there is a command I need to run, but for whatever reason I'm getting an error. The command is,
grub-mkstandalone -o bootx64.efi -d usr/lib/grub/x86_64-efi -O x86_64-efi -C xz boot/grub/grub.cfg
and error I'm getting is,
grub-mkstandalone: -C: (PROGRAM ERROR) Option should have been recognized!?
Google searching the error yielded 2 results
Last edited by ipatch (2014-05-22 18:35:32)

Looks like the -C flag has been deprecated:
claire ~ % grub-mkstandalone --help
Usage: grub-mkstandalone [OPTION...] [OPTION] SOURCE...
Generate a standalone image (containing all modules) in the selected format
--compress[=no,xz,gz,lzo] compress GRUB files [optional]
-d, --directory=DIR use images and modules under DIR
[default=/usr/lib/grub/<platform>]
--fonts=FONTS install FONTS [default=unicode]
--install-modules=MODULES install only MODULES and their dependencies
[default=all]
-k, --pubkey=FILE embed FILE as public key for signature checking
--locale-directory=DIR use translations under DIR
[default=/usr/share/locale]
--locales=LOCALES install only LOCALES [default=all]
--modules=MODULES pre-load specified modules MODULES
--themes=THEMES install THEMES [default=starfield]
-v, --verbose print verbose messages.
--core-compress=xz|none|auto
choose the compression to use for core image
-o, --output=FILE save output in FILE [required]
-O, --format=FILE generate an image in FORMAT
available formats: i386-coreboot, i386-multiboot,
i386-pc, i386-pc-pxe, i386-pc-eltorito, i386-efi,
i386-ieee1275, i386-qemu, x86_64-efi, i386-xen,
x86_64-xen, mipsel-yeeloong-flash,
mipsel-fuloong2f-flash, mipsel-loongson-elf,
powerpc-ieee1275, sparc64-ieee1275-raw,
sparc64-ieee1275-cdcore, sparc64-ieee1275-aout,
ia64-efi, mips-arc, mipsel-arc,
mipsel-qemu_mips-elf, mips-qemu_mips-flash,
mipsel-qemu_mips-flash, mips-qemu_mips-elf,
arm-uboot, arm-efi, arm64-efi
-?, --help give this help list
--usage give a short usage message
-V, --version print program version
Mandatory or optional arguments to long options are also mandatory or optional
for any corresponding short options.
Graft point syntax (E.g. /boot/grub/grub.cfg=./grub.cfg) is accepted
Report bugs to <[email protected]>.
I couldn't find -C in the man-page either.

Dual booting Arch and Ubuntu

Hi, I would like to dual boot Arch and Ubuntu using GRUB2.
I already have Arch, set up as it's described in the Beginner's Guide, with GRUB2 installed. How would I go about dual booting Ubuntu, preferably without overwriting the existing bootloader?
I haven't tried anything yet, but the problem that I can see is resizing my /home; is this possible on the Ubuntu liveDVD? If not, would I be able to resize /home with my gParted liveCD?
Unfortunately, I have no backup media to use, so I wouldn't be able to transfer anything away as a backup.
Here is my partition table:
%lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 30G 0 part /
├─sda2 8:2 0 12G 0 part [SWAP]
├─sda3 8:3 0 5M 0 part
└─sda4 8:4 0 889.5G 0 part /home
sda1 is my root partition, sda2 is swap, sda3 is GRUB's boot partition, which I was told that I needed in the guide, and sda4 (/home) occupies the "rest of the disk".
I am using a GPT-partitioned drive, as I read this has many advantages and I do not plan to triple-boot Windows.
So, can someone tell me what I do if I want to dual boot Ubuntu? I'm very sorry if this should have been posted on the Ubuntu forums, but I'm just more familiar with Arch, and I already have it installed. Please ask if you need any other files like my fstab. I have my Ubuntu liveDVD, GParted live CD (and Arch CD) at hand.
Thanks in advance, rberyl.
(Also, does anyone else think it's a bit of a backwards thing to put the output of "date -u +%W$(uname)|sha256sum|sed 's/\W//g'" as a sign-up question? )
Last edited by rberyl (2012-12-29 11:45:23)

Hi rberyl,
You can change your partitions using an inbuilt tool like cfdisk, or if you'd prefer a GUI gparted can be installed from the Arch repos. This will allow you to shrink sda4, and set up the new partitions for your Ubuntu OS. Although this shouldn't cause any data loss, its best practice to back up just in case.
When installing Ubuntu, be sure to opt-out of bootloader creation. I think you have to use the alternate installation media to get this option. You can add your Ubuntu partition to the existing bootloader by running osprober (available from the repos) and then running grub-mkconfig -o /boot/grub/grub.cfg . Alternatively, you can manually edit your GRUB config. See https://wiki.archlinux.org/index.php/GR … NU.2FLinux for instructions.
Good luck!
Last edited by smazza (2012-12-29 16:04:08)

Pros and cons of various dual boot and virtual options?

I have purchased a 500 GB hdd 8 GB RAM Macbook Air with the intent of being able to run a few PC programs (i.e., no Mac versions) a few times a week, both of which are radiology image viewing programs. I can cover other programs with Mac software versions.
Years ago I worked briefly with a computer that used Parallels. It seemed to be OK--in fact, there was a compatilbility mode that allowed me to run PC programs along with the native Mac programs, so it must have been a virtual setup.
With this new hardware, I can make my own choice about whether to do a frank dual boot or whether to run Windows 7 as a virtual machine, I guess, under Parallels or VMWare. I would appreciate any input from people who have experience with doing any of the combinations, including comments about how difficult the installation is/was and whether there is a noticeable slow-down because of use of resources, particularly with the virtual methods. My Air boots quite quickly--does the boot time into Win 7 with Boot Camp extend boot time significantly? What other questions should concern me? (one other question that I asked in a different part of the forum concerns the difference between PC and Mac keyboards and how that is handled with dual boot or virtual machines...)
Thanks
Ken K

There are some other options for running PC programs on your Mac besides installing Windows, which have the great advantage of not requiring Windows on your Mac, which is like putting a turd on your hamburger. Two options I have used are Wine winebottler.kronenberg.org and Crossover Run Windows on Mac and Linux, easily and affordably - CodeWeavers . Crossover is a bit easier to use, and Wine is free. Not every PC app will work on them, but many do.
Running a virtual machine will definitely be slower than boot camp. How slow will depend on the app and how much RAM it needs. MRIs and CTs with a lot of images can use a lot of disk space and memory.
If you have windows on your Mac you will need virus protection at least on the Windows part, which will slow your Mac down more.
I have used OsiriX for Mac, and it works well. OsiriX (Mac) - Download

WinXP dual boot Solaris on 2nd hard drive problem...

Hi there ppl,
run into a bit of a prob with dual booting winxp and solaris. I have WinXP on 1st hard drive and Solaris on 2nd hard drive 2 (Solaris - partition 1 with slice 0 x86 active, DOS - partition 2 for installing linux later, DOS - partition 3 for fat32 file storage later).
I want to boot to Solaris on drive 2 from the WinXP boot loader on drive 1. Could somebody please tell me exactly how to do this as I've copied the bootsect.sun file from Solaris via floppy to the WinXP C:\ drive, and edited the WinXP boot loader to:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect
multi(0)disk(0)rdisk(1)partition(1)C:\bootsect.sun="Solaris/x86"
and when I select to boot to Solaris I get:
Windows could not start because the following is missing or corrupt:
<Windows root>\system32\hal.dll
Please reinstall a copy of the above file
WinXP still boots ok.
Any help would be much appreciated, thanks already.

I am having a same issue....
1.....1st 80 GB hard disk, I had window XP installed. (NTFS format)
2....add 200 GB, 2nd hard drive, make 3 partitions, on first 50GB partition I have install Solaris 10.....Having some issue with network config, but its resolve, thank this forum.....
Now, everytime when ever I need to go to Solarid, I have to go in BIOS screen and switch HD, I mean if I want to boot to solaris, I have to make a 2nd (200GB) hd primary..Soaris work fine, but from the GRUB menu, if I select window, its get hung up...
now if I want to boot to window, again I have to go to BIOS and need to switch around hdd.... make 1st (80GB) hdd primary, windows work fine....
Questions are, I do not want to go bacK & forth in BIOS.....
1....Can some one help me, provide me the step-by-step information that how can i set up dual boot, so I can use my 2nd drive (200GB) as a primary and from the GRUB, I select windows and its boot to windows... if its otherway around,,,its still ok....I don't want my kids mess up BIOS....
2...What is a chainloader+1...can some one explain?...what is +1 mean.
3....How to install GRUB in MBR?
Lion-O any ideas, how to boot windows bootloader from 2nd HD? Please step-by-step Instuctions....

Setting up a "Dual Boot" system by adding Lion to an external HD

I had originally thought to put my present Snow Leopard with Parallels OS's on an external HD the upgrading my internal HD to Lion in order to retain my Classic Application (AppleWorks in particular) capability for access to about a thousand old AppleWorks documents, all three genre-WP,SS,Graphics. I just received my new hard drive and it suddenly occurreced to me that it would probably be better to add Mountain Lion to the external drive rather than fiddle with the setup/contents of my internal drive.
In this regard, once I purchase Mountain Lion, what would be the procedures to create this dual boot capability after partitioning my External drive to receive Lion on one partition?
Also, once the system is in place, how to move certain applications, and their associated document files, over to be used on Mountain Lion?
Sparkgapper

With Mountain Lion on the External, how does that creat a Dual Boot capability?
I will not be doing anything to the internal drive with Snow Leopard other than setting up the dual boot.
Sparkgapper

Creating a dual boot HD Windows 7 32 and Windows 7 64 bit OS

I have a 750 GB HD with one bootable partition of Windows 7 32 bit OS using 320 GB space. Was cloned from a HD that was physically 320 GB. Still have 400 GB unallocated space on the HD. HD is currently in a ultrabay and I can boot from either the internal 320 GB HD or the 320 GB partition on the 750 GB HD. Can put the Ultrabay in either a T61 or T61P laptop. Have the 64 bit install DVD for Windows 7 and would like to install it on the unpartitioned space on my 750 GB HD using some or all of the 400 GB unpartitioned space. How do I create the dual boot system on the Ultrabay 750 GB harddrive?

All you have to do is install the windows, it will install a boot manager so you can select among the operating systems.
Also understand that the drive installed in your ultrabay will run slower, so you're best to use the boot drives as your primary drive and use an ultrabay drive only for storage.
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Dual boot with Two HDDs using GRUB?

I thought I understood GRUB but this has got me puzzled.
If I have two HDDs:
hd0 = XP
hd1,0 = Vista
hd1,1 = Arch (I installed GRUB to this partition as well)
and I want to use NTLDR to chainload GRUB, how do I do it if NTLDR is on (hd0,0)?
On a normal (single HDD) dual boot setup it is quite easy: install the GRUB files to (hd0,1), dd the first 512 bytes in /dev/hda2 and copy it to hda1, then edit the boot.ini file in hda1 to load the dd image saved there.
However, when NTLDR is on (hd0,0) and the GRUB stage1.5 and stage2 files are on (hd1,1) how can I achieve a dual boot system using NTLDR to chainload GRUB? Can GRUB stage1 load from (hd0,0) and look for stage1.5/stage2 on a completely separate hard drive (hd1,1)? Or can't it be done?
As I said, it's got me beat. Has anyone achieved this?
Last edited by Shagbag (2007-10-30 16:36:12)

TheSaint wrote:It'll be necessary to configure mkinitcpio to address the correct path in order that the future kernel updates will go to ther right place.
See this for details.
I don't think so -- the use of a bind mount means that the kernel image can go in the standard location, that's the whole point of it.
@OP: Yes, just make sure to call the path to the respective kernel images relative to $ESP

HT3777 how to undo partition for boot camp

I want to undo the partition for boot camp, we never use it and use VMware
instead. Can this be done?

So you never installed Windows natively and Fusion is not using anything other than its own image?
Some people dual boot and use VM.
http://support.apple.com/kb/HT4818
The install guide is also how to remove the partition, you do so from same utility.
http://support.apple.com/manuals/#macos
Seeing you are on 10.5.8 ? then that really goes back to 2008, too.
But G5s never supported Windows, so guess you have a different system now.

Dual Boot Virus Clearance. How?

I have a dual booted Mac Book Pro with Windows 7 and iOS, partitioned and running boot camp.
The windows side has got a virus; well I am 99% sure. Booting normally, I log in and get a black or white screen. After booting in Safe Mode it shuts down automatically no mater what I do.
The Mac side is fine; I am writing this from there. How do I use this side of the mac to scan aand clear the other partition of the virus?
I have heard its possible but cant seen to find out how to do it.

If you can not do anything in Normal or Safe mode boot, then only other options are listed here.
http://windows.microsoft.com/en-US/windows7/What-are-the-system-recovery-options -in-Windows-7
I copy text from above. Assuming that you have no external Image backup of good OS, if my ** or *** items below do not work, you can, selecting your Windows 7 installation CD/Media in boot from Mac's Option key menu, reinstall Windows 7 (update) to the space you put it to in bootcamp area. An update will preserve your data to
C:\Windows.Old folder.
What are the system recovery options in Windows 7?
The System Recovery Options menu contains several tools, such as Startup Repair, that can help you recover Windows from a serious error. This set of tools is on your computer's hard disk and on the Windows installation disc.
System recovery options
Startup Repair (**Try this first)
Fixes certain problems, such as missing or damaged system files, that might prevent Windows from starting correctly. For more information, see Startup Repair: frequently asked questions.
System Restore (from RestorePoints created by Windows Updates)
Restores your computer's system files to an earlier point in time without affecting your files, such as e-mail, documents, or photos.
If you use System Restore from the System Recovery Options menu, you cannot undo the restore operation. However, you can run System Restore again and choose a different restore point, if one exists. For more information, see What is System Restore? and System Restore: frequently asked questions.
System Image Recovery
You need to have created a system image beforehand to use this option. A system image is a personalized backup of the partition that contains Windows, and includes programs and user data, like documents, pictures, and music. For more information, see What is a system image?
Windows Memory Diagnostic Tool (this won't help in your case)
Scans your computer's memory for errors. For more information, see Diagnosing memory problems on your computer.
Command Prompt (Running Admin level CMD: SFC /SCANNOW is rather complex)
Advanced users can use Command Prompt to perform recovery-related operations and also run other command line tools for diagnosing and troubleshooting problems.
Note (won't be true in your case)
Some computer manufacturers might customize the menu by adding or removing recovery tools, or including their own tools.
To open the System Recovery Options menu on your computer
1. Remove all floppy disks, CDs, and DVDs from your computer, and then restart your computer using the computer's power button.
2.***Try this if ** did not fix) Do one of the following: (You need to have Bootcamp as default here)
If your computer has a single operating system installed, press and hold the F8 key as your computer restarts. You need to press F8 before the Windows logo appears. If the Windows logo appears, you need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer.
If your Bootcamp has more than one Windows operating system, use the arrow keys to highlight the operating system you want to repair, and then press and hold F8.
3. On the Advanced Boot Options screen, use the arrow keys to highlight Repair your computer, and then press Enter. (If Repair your computer isn't listed as an option, then your computer doesn't include preinstalled recovery options, or your network administrator has turned them off.)
4. Select a keyboard layout, and then click Next.
5. On the System Recovery Options menu, click a tool to open it.
To open the System Recovery Options menu using the Windows 7 installation disc or a USB flash drive, or a system repair disc
If your computer's system is severely damaged and you can't access the (F8) System Recovery Options menu on your computer, you can access it using the Windows 7 installation disc or a USB flash drive, or using a system repair disc if you created one earlier.
To use this method, you need to restart (boot) your computer using the disc or USB flash drive.
1. Insert the Windows 7 installation disc or USB flash drive, or a system repair disc, and then shut down your computer.
2. Restart your computer using the computer's power button.
3. When prompted, press any key, and then follow the instructions that appear.
4. On the Install Windows page, or on the System Recovery Options page, choose your language and other preferences, and then click Next.
If neither the Install Windows page nor the System Recovery Options page appear, and you're not asked to press any key, you might need to change some system settings. To learn how to do this, see Start your computer from a Windows 7 installation disc or USB flash drive.
5. If you are using the Windows installation disc or USB flash drive, click Repair your computer.
6. Select the Windows installation you want to repair, and then click Next.
7. On the System Recovery Options menu, click a tool to open it.
Note: after a Windows 7 install you should have Firewall settings limited to Core Networking.
It is also not a bad idea to disable Remote control of your OS in Control Panel->System->Advanced System Settings->Remote Tab
The first thing you should do is download Security Essentials http://windows.microsoft.com/en-us/windows/security-essentials-all-versions unless you have to run Bootcamp driver updates to make your computer work. In Windows 8 you do not need this.
P.S. You can learn more about Windows 7 by topic here:
http://windows.microsoft.com/en-US/windows7/products/features/windows-essentials

New to Mac... I have partitioned my hard drive Dual Boot M.Lion/S. Leopard with 2 OS partitions and a Media Partition. How do I direct my file storage to the Media Partition? Can I put a "Media" folder on both OS Desktops that will allow me to drag n drop

New to Mac... I have Partitioned my MacBookPro with Dual Boot Partitions running M.Lion and S. Leopard and a seperate media partition.
How do I assign my storage to the MEDIA Partition once I am booted in either OS?
Can I place a folder on my desktop so I can read/write ALL my media to?

Why not? Make a folder in your media partition and put an alias folder (shortcut) on the desktop of each partition/ OS. You can right click on the folder in the media partition and click on "make alias".
If you want to direct your iTunes media to point to the media partition, google "move iTunes library to external disk" and follow the steps; the instructions should be the same for a seperate partition as it is for an external drive.

How to install redhat linux on my macbook pro marvericks osx as a dual boot

how to install redhat linux on my mac as a dual boot

I can use disk0s4 to install linux. I have already partitioned it for the vmware.

How do i set up a dual boot with windows

I am trying to set up a dual boot system with both the snow leapard and win 7, I have partioned the drive and have windows booting up. How do I get the drivers for the machine that windows will recognize. I am researching this for my dad his I mac is one of the new 21 inch models.

If you want dual boot you would use Boot Camp which is built into Snow Leopard. You will need a license of WIndows 7. You can install it by using Boot Camp Assistant however prior to doing so you probably should look at how it's correctly done, here is a You Tube Boot Camp instructions video I would recommend you watch first.
If your dad wants to run Windows 7 & OS X simultaneously then he will need either Parallels or VMWare Fusion. Both are virtualization applications that allow one to run Windows and OS X side by side. This is a great solution unless he is a gamer or needs to run graphics intensive applications like CAD/CAM or 3D Games or anything that is 3D intensive. For all other types of applications virtualization is an excellent solution.
If you choose the Boot Camp solution there is a forum specifically for that which is where I'd recommend posting questions.
Roger

How do I undo a dual boot?

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