Fixing grub after reinstalling windows on a dual boot system

SO i ned to reinstall widnows on my windows partition
my partition table looks like
sda1 windows
sda2 swap
sda3 root
sda4 extended
sda5 home
What i dont want to happen is during the instillation of Micro$oft is my bootloader screw up and i cant boot into arch without being able to fix.
What steps do i ned to take before i install so that I do not have to reinstall arch again ot get the mbr disc correct?
*BUMP**
Last edited by nmodlin (2009-08-04 19:07:06)

musta ruhtinas wrote:I don't think there is anything you can do prior to a Windows installation that will prevent it.
The simplest way I know of to restore GRUB would be to use the Super Grub boot disk from here .
+1
Super Grub is your best friend
It got me out of some very unplesant mbr/bootloader problems in the past

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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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Separately encrypt dual-boot system: Windows+Arch

Hey guys, I want to use a dual-boot system: Windows 7 + Arch (windows being first on hdd). I would also want to encrypt them, but make it so I could access them with different passwords, like if I enter arch, i woudn't be able to see contents of windows, and vice-versa. I need arch to be on LVM, ext4 filesystem(the latter not so important, if it's trouble).
I've come accross this guide: https://aprescott.com/posts/dual-bootin … encryption which describes windows 7 encrypted with truecrypt + arch(on lvm) encrypted with dm-crypt+luks, grub legacy is put inside MBR, truecrypt bootloader resides on linux /boot, copied from MBR after truecrypt installed it there and then replaced with GRUB. With described approach there is windows boot partition and linux boot partition which remain unencrypted.
1) The question is, is it possible to do something similar but make those boot partitions encrypted too? so the only thing unencrypted would be MBR? I've read that people used Disc cryptor and with it easily encrypted windows boot partition with no trouble. What about linux boot partition? Maybe there is a way not to make separate /boot for linux, and encrypt the whole lvm partition with truecrypt(so truecrypt would install it's bootloader into MBR and i could save it and use just like in the link i gave above)?
2)Another question is for people using truecrypt for whole disk encryption. When you do full disk encryption or system encryption(for example Windows), the only thing left unencrypted is MBR? Is the boot sector of windows partition encrypted too? So in this case it maybe possible to keep MBR(at least the bootloader, without partition table) on separate media.
3)Also, in case of full disk encryption, is partition table encrypted too?
and please, I don't want questions as "Why do you need it this way?". I just want to have full disk encryption, so if the MBR is the only thing unencrypted I could keep it on separate media and boot from it(Disc Cryptor allows such feature), but I also need the system to be split into windows and linux parts, accessible by different passwords. And I dont think the idea of using truecrypt hidden partition and hidden os is good in here.
Thanks in advance.
Last edited by Kape (2013-01-24 13:58:41)

hiciu wrote:
/dev/sda
+--------------------------------------+
|(mbr and partition table) |
| +----------------------------------+ |
| |(truecrypt) windows boot partition| |
| |----------------------------------| |
| |(truecrypt) windows 7 | |
| |----------------------------------| |
| |linux boot partition | |
| |----------------------------------| |
| |(lvm on luks) | |
| | +------------------------------+ | |
| | |rootfs | | |
| | |------------------------------| | |
| | |home | | |
| | |------------------------------| | |
| | |swap | | |
| | +------------------------------+ | |
| +----------------------------------+ |
+--------------------------------------+
3)Also, in case of full disk encryption, is partition table encrypted too?
Take a look at diagram #1 . Mbr and partition table will be not encrypted. You don't want that: there are no sensitive data in there; both windows and linux need to access partition table to know where are partitions on disk; mbr must contain some not encrypted code that will be loaded by bios, since that code can't be encrypted it can be modified (potentially in such a way to hide the modifications from the system), as long as you boot from this device there is no way around it without "secure boot" and mbr singing.
I believe windows boot partition and windows partition can be encrypted with truecrypt (you need to check that, I don't know truecrypt). There still will be some minimal not encrypted bootloader in order to ask you for for key / passphrase, so it is not 100% secure (someone could replace it; search for "evil maid" attack by Joanna Rutkowska).
Linux bootloader (I forgot about it on diagram) and linux boot partition can't be encrypted (again, unless you do: truecrypt -> grub2 / syslinux -> linux, and there still will be not encrypted minimal bootloader).
You see, the problem is always the same: you can't boot from encrypted device. You need something that will decrypt it first.
I just want to have full disk encryption, so if the MBR is the only thing unencrypted I could keep it on separate media and boot from it(Disc Cryptor allows such feature), but I also need the system to be split into windows and linux parts, accessible by different passwords.
In order to secure boot partitions / bootloaders one could separate encryption and bootloaders, keep data on encrypted disk and keep bootloaders code at secure location (i.e. on pen drive attached to key chain). Take a look at diagram #2:
/dev/sda /dev/usb-stick
+--------------------------------------+ +--------------------------+
|(mbr and partitions table) | |(mbr and partitions table)|
| +----------------------------------+ | | +----------------------+ |
| |other data / partitions | | | |linux boot partition | |
| +----------------------------------+ | | | +------------------+ | |
| |(lvm on luks) | | | | |grub / syslinux | | |
| | +------------------------------+ | | | | |kernel | | |
| | |rootfs | | | | | |initramfs | | |
| | |------------------------------| | | | | +------------------+ | |
| | |home | | | | +----------------------+ |
| | |------------------------------| | | +--------------------------+
| | |swap | | |
| | +------------------------------+ | |
| +----------------------------------+ |
+--------------------------------------+
In this setup you boot your system from usb stick. Bios will load and execute mbr and bootloader from usb stick (and you know its good since you have it physically secured), it should decrypt luks and boot system. You still can run windows with truecrypt using /dev/sda as boot device. I know I didn't exactly answered your questions.
1)so this way i can leave mbr(including partition table) empty on hdd, while having them on usb stick? good. I can put copy of mbr with truecrypt loader on that usb stick too along with /boot partition just like in the link i gave above? So there would be NOTHING left unencrypted on my hdd? i like it.
2)My main goal is that hdd would look like blank if someone would want to check its contents. I've heard using Luks leaves some traces in the volume header?(it's not possible to use truecrypt for full linux system encryption too, right?)
3)How do i properly put /boot on usb stick? Also will there be any troubles updating arch with /boot being on separate media?
thanks!

[Forum FAQ]How to customize Windows 7 & Windows 8.1 dual boot menu

Scenario 1:
When you install Windows 8.1 on Windows 7 based computer, the default boot option is Windows 8.1 boot options menu which is shown as Figure 1:
If you want to use the old Windows 7 boot menu, follow these steps:
Start the computer and then go into
Windows 8.1 boot options menu which is shown as Figure 1.
Click
Change defaults or choose other options, and Options menu appears which is shown as Figure 2.
Click
Choose a default operation system option.
Click
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Restart, and it will be changed to
Windows 7 boot options menu which is as shown as Figure
Scenario 2:
If you have Windows 7 and Windows 8.1 dual-boot configuration, and the default boot menu is Windows 7 boot options menu which is shown as Figure 4.
If you want to get the GUI as Windows 8.1 style, follow these steps:
Boot into Windows 8.1 computer, open the
command Prompt (Admin).
Type the following command
bcdboot c:\Windows and press Enter.
Restart, and you'll see the Windows 8.1 boot options menu which is as shown Figure 1.
Scenario 3:
When you have dual-boot system, one of the system disappear from the boot menu. We could follow these steps to get it back:
Boot the computer from the installation media (Here my example is Windows 7) that works fine system.
Go into
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Click
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Use the
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Backup the bcd file, rename it.
Rebuild a new bcd file. It will scan all disk to confirm all Windows installation on your computer and ask if you want to add them to boot list.
Type
Y to agree with adding to boot list. In next boot, you will get all boot options back in the boot menu.
Please click to vote if the post helps you. This can be beneficial to other community members reading the thread.

Since you've selected as default OS as Windows 8.1 you can go to disk management console and format the drive as required.
You can remove the Win 7 entry from boot loader:
To launch msconfig:
Click Start
In the Search text box, type msconfig
Launch msconfig by selecting it from the search results above the search text box.
After msconfig is launched:
Go to the Boot tab
Slect the boot entry you want to delete.
Click the Delete button and then click OK.
Arnav Sharma | http://arnavsharma.net/ Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
the thread.

Fixing grub after reinstalling windows on a dual boot system

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