Windows 7 boot option missing after installing CentOS 7, how can I get it back?

Windows 7 boot option missing after installing CentOS 7, how can I get it back?

 

After installing Centos7, windows 7 is not showing at the boot time. Centos 7 is accessible.

My boot folder entries:

[root@localhost boot]# ls -ltr
total 89176
-rw-------. 1 root root  2840084 Jun 30 07:17 System.map-3.10.0-123.el7.x86_64
-rw-r--r--. 1 root root   122059 Jun 30 07:17 config-3.10.0-123.el7.x86_64
-rwxr-xr-x. 1 root root  4902656 Jun 30 07:17 vmlinuz-3.10.0-123.el7.x86_64
-rw-r--r--. 1 root root   228562 Jun 30 07:20 symvers-3.10.0-123.el7.x86_64.gz
drwxr-xr-x. 2 root root     4096 Nov 21 05:27 extlinux
drwxr-xr-x. 2 root root       26 Nov 21 05:28 grub
-rw-r--r--. 1 root root   867424 Nov 21 05:38 initrd-plymouth.img
-rw-r--r--. 1 root root 42219459 Nov 21 05:39 initramfs-0-rescue-4d161cb1c811459b927aed6f75f7deed.img
-rwxr-xr-x. 1 root root  4902656 Nov 21 05:39 vmlinuz-0-rescue-4d161cb1c811459b927aed6f75f7deed
-rw-r--r--. 1 root root 17637360 Nov 21 05:40 initramfs-3.10.0-123.el7.x86_64.img
-rw-r--r--. 1 root root 17584068 Nov 21 11:59 initramfs-3.10.0-123.el7.x86_64kdump.img
drwxr-xr-x. 6 root root      104 Nov 25 02:52 grub2

fdisk -l output

[root@localhost boot]# fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/sda: 250.1 GB, 250059350016 bytes, 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: gpt


#         Start          End    Size  Type            Name
 1         2048       206847    100M  EFI System      EFI system partition
 2       206848       468991    128M  Microsoft reser Microsoft reserved partition
 3       468992    348162047  165.8G  Microsoft basic Basic data partition
 4    348162048    348164095      1M  BIOS boot parti 
 5    348164096    349188095    500M  Microsoft basic 
 6    349188096    488396799   66.4G  Linux LVM       

Disk /dev/mapper/centos-swap: 8262 MB, 8262778880 bytes, 16138240 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-root: 42.3 GB, 42341498880 bytes, 82698240 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-home: 20.7 GB, 20669530112 bytes, 40370176 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

bklid output

[root@localhost boot]# bklid
bash: bklid: command not found...
Similar command is: 'blkid'
[root@localhost boot]# blkid
/dev/sr0: UUID="2011-04-12-02-38-58-00" LABEL="GSP1RMCPRXFRER_EN_DVD" TYPE="udf" 
/dev/sda1: UUID="20DD-5268" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="ef67b4eb-4514-4824-a1ba-d8d045e96f26" 
/dev/sda3: UUID="EAD6EA4AD6EA169B" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="fa8c0ee9-2913-45ec-b016-0c6eb2e4aab8" 
/dev/sda5: UUID="368a42d5-e9f9-4c81-81e2-70afe2344b6b" TYPE="xfs" PARTUUID="7447a676-d39b-46fc-948b-f1c4a3b4bf9c" 
/dev/sda6: UUID="VfFTVf-Rdy5-kLFT-Zyys-PIEf-PnOo-gSZfLZ" TYPE="LVM2_member" PARTUUID="b2677b42-22fb-42f8-a287-77ad0638b674" 
/dev/mapper/centos-swap: UUID="155e4385-547c-4c0b-94bd-13882f078548" TYPE="swap" 
/dev/dm-2: UUID="a4709eae-75fd-4423-8f11-64762df974df" TYPE="xfs" 
/dev/dm-1: UUID="24a077fa-6b00-4da0-9d07-34048d84d853" TYPE="xfs"

grub2-mkconfig -o /boot/grub2/grub.cfg command output

[root@localhost boot]#  grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
Warning: Please don't use old title `CentOS Linux, with Linux 3.10.0-123.el7.x86_64' for GRUB_DEFAULT, use `Advanced options for CentOS Linux>CentOS Linux, with Linux 3.10.0-123.el7.x86_64' (for versions before 2.00) or `gnulinux-advanced-24a077fa-6b00-4da0-9d07-34048d84d853>gnulinux-3.10.0-123.el7.x86_64-advanced-24a077fa-6b00-4da0-9d07-34048d84d853' (for 2.00 or later)
Found linux image: /boot/vmlinuz-0-rescue-4d161cb1c811459b927aed6f75f7deed
Found initrd image: /boot/initramfs-0-rescue-4d161cb1c811459b927aed6f75f7deed.img
done

Here is the content of /boot/grub2/grub.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set pager=1

if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

terminal_output console
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'CentOS Linux, with Linux 3.10.0-123.el7.x86_64' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-123.el7.x86_64-advanced-24a077fa-6b00-4da0-9d07-34048d84d853' {
    load_video
    set gfxpayload=keep
    insmod gzio
    insmod part_gpt 
    insmod xfs
    set root='hd0,gpt5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt5 --hint-efi=hd0,gpt5 --hint-baremetal=ahci0,gpt5 --hint='hd0,gpt5'  368a42d5-e9f9-4c81-81e2-70afe2344b6b
    else
      search --no-floppy --fs-uuid --set=root 368a42d5-e9f9-4c81-81e2-70afe2344b6b
    fi
    linux16 /vmlinuz-3.10.0-123.el7.x86_64 root=UUID=24a077fa-6b00-4da0-9d07-34048d84d853 ro rd.lvm.lv=centos/swap vconsole.font=latarcyrheb-sun16 rd.lvm.lv=centos/root crashkernel=auto  vconsole.keymap=us rhgb quiet 
    initrd16 /initramfs-3.10.0-123.el7.x86_64.img
}
menuentry 'CentOS Linux, with Linux 0-rescue-4d161cb1c811459b927aed6f75f7deed' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-4d161cb1c811459b927aed6f75f7deed-advanced-24a077fa-6b00-4da0-9d07-34048d84d853' {
    load_video
    insmod gzio
    insmod part_gpt 
    insmod xfs
    set root='hd0,gpt5'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt5 --hint-efi=hd0,gpt5 --hint-baremetal=ahci0,gpt5 --hint='hd0,gpt5'  368a42d5-e9f9-4c81-81e2-70afe2344b6b
    else
      search --no-floppy --fs-uuid --set=root 368a42d5-e9f9-4c81-81e2-70afe2344b6b
    fi
    linux16 /vmlinuz-0-rescue-4d161cb1c811459b927aed6f75f7deed root=UUID=24a077fa-6b00-4da0-9d07-34048d84d853 ro rd.lvm.lv=centos/swap vconsole.font=latarcyrheb-sun16 rd.lvm.lv=centos/root crashkernel=auto  vconsole.keymap=us rhgb quiet 
    initrd16 /initramfs-0-rescue-4d161cb1c811459b927aed6f75f7deed.img
}
if [ "x$default" = 'CentOS Linux, with Linux 3.10.0-123.el7.x86_64' ]; then default='Advanced options for CentOS Linux>CentOS Linux, with Linux 3.10.0-123.el7.x86_64'; fi;
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.



### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

I have tried adding below entry to 40_custom and ran "grub2-mkconfig -o /boot/grub2/grub.cfg", could not find windows in the output. The entry shows in the boot menu but gives an error "Missing BOOTMGR" when clicked.

menuentry 'Windows 7 (loader) (on /dev/sda3)' --class windows --class os $menuentry_id_option 'osprober-chain-EAD6EA4AD6EA169B' {
    insmod part_gpt
    insmod ntfs
    set root='hd0,gpt3'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root –hint-bios=hd0,gpt3 --hint-efi=hd0,gpt3 --hint-baremetal=ahci1, gpt3   EAD6EA4AD6EA169B
    else
      search --no-floppy --fs-uuid --set=root  EAD6EA4AD6EA169B
    fi
    chainloader +1
}

 

restore windows 7 bootloader after installing Centos

Ok, That, I had Windows 7 on hard disk, and have free logical disk, so I decided install Centos 6.4 to here. But after installing I see boot shows Centos 6.4 and Other. If I choose Other , I can't load windows. I remember that, when installing Centos I choose default boot as windows boot.

So, now, What I should do for repair windows bootloader ?

Edit:

[root@dhcppc0 grub]# fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000953c6

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1       15678   125931520    5  Extended
/dev/sda2   *       15678       15691      102400   42  SFS
/dev/sda3           15691       36189   164645888   42  SFS
/dev/sda4           36189      121602   686080728   42  SFS
/dev/sda5               1          65      512000   83  Linux
/dev/sda6              65        7897    62914560   83  Linux
/dev/sda7            7897       15156    58306560   83  Linux
/dev/sda8           15156       15678     4193280   82  Linux swap / Solaris
 
 
I remember having this problem once a few years back. Here's how i fixed the problem:

Insert the windows installation disc and click through until you reach the screen with the "install now" button. But instead of clicking that button, click on "repair your computer" further down. Then choose "use recovery tools..", then click on the command prompt button.

In CMD type:  

# bootrec /fixmbr

This should repair the master boot record.

  • 1
    I'd try this, but windows still doesn't boot.
  • And if it worked then CentOS wouldn't boot. Windows doesn't play nicely with other OSs - you have to install Windows first, then install the other OS, then fix Grub so that it recognizes both. 

Windows 7 Boot Loader Problems

  1. Insert the Windows 7 installation DVD OR Bootable USB
  2. Select Repair your computer option windows takes some time to load what ever Error got just click OK Or NEXT
  3. Once you have reached the System Recovery Options screen click Command Prompt to continue

Enter following command

Bootrec /Fixmbr

if not works then try

Bootsect /nt60 c:

 

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