Windows 10 not recognised

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handra
Posts: 4
Joined: 2018/01/19 15:08:38

Windows 10 not recognised

Post by handra » 2018/01/19 15:11:54

Hi,

I would like to seek for solution to my problem.

My laptop, Lenovo brand, has Windows 10 installed by default. Today, I installed CentOS 7. After installation, as usual, Grub is installed on my laptop now. However, my Windows 10 installation cannot be found.
Note that during CentOS installation, I choose 1 partition to be formatted as / on my Linux, and another one for /boot/efi. I'm not sure if this mess is because of this.

I have used recovery disk to boot and tried to do automatic repair, but no luck. I as well have tried to perform the bootrec /fixboot, /fixmbr, and /rebuildbcd commands without luck. The rebuildbcd command complained that no Windows installation was found.

Please help me to make my Windows recognisable again. All my data are still there. I can access my Windows partitions in my Linux. Only boot to Windows is my problem.

Here is the screenshot of my partition for your reference.
https://filestore.community.support.mic ... pload=true

Let me know if you need further information.

Thanks in advance.

owl102
Posts: 307
Joined: 2014/06/10 19:13:41

Re: Windows 10 not recognised

Post by owl102 » 2018/01/19 17:00:58

handra wrote:However, my Windows 10 installation cannot be found.
How exactly do you define "cannot be found"?

When you enter the boot menu of your UEFI, is Windows listed there?

If you reference to the Linux/Grub boot menu: Yes, Windows isn't listed there by default. Install

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yum install epel-release
yum install ntfs-3g
and post the output of the command "os-prober".
Note that during CentOS installation, I choose 1 partition to be formatted as / on my Linux, and another one for /boot/efi.
Hopefully you did choose your already existing ESP for /boot/efi and did not choose to format it during installation.

Otherwise you either have two ESP now (which could confuse both, UEFI and the Windows Installer/Repair), or you have a single one with CentOS bootloader only.
Here is the screenshot of my partition for your reference.
Please post the output of the following commands (as root):

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os-prober
mount
fdisk -l /dev/sda
ls /boot/efi/EFI
efibootmgr -v
(as text, not as screenshot)

handra
Posts: 4
Joined: 2018/01/19 15:08:38

Re: Windows 10 not recognised

Post by handra » 2018/01/20 02:55:57

Hopefully you did choose your already existing ESP for /boot/efi and did not choose to format it during installation.

Otherwise you either have two ESP now (which could confuse both, UEFI and the Windows Installer/Repair), or you have a single one with CentOS bootloader only.
I think I did choose to reformat this partition. I guess that causes quite a mess? In fact, when I tried to perform automatic recovery using Windows recovery disk, it failed to fix the boot :(
Please post the output of the following commands (as root):
Below the result for your reference:

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[root@GALAXY handra]# os-prober 
[root@GALAXY handra]# 

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[root@GALAXY handra]# mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=3917084k,nr_inodes=979271,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,seclabel,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,seclabel,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_prio,net_cls)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/sda4 on / type ext4 (rw,relatime,seclabel,data=ordered)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=11002)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
mqueue on /dev/mqueue type mqueue (rw,relatime,seclabel)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,seclabel)
nfsd on /proc/fs/nfsd type nfsd (rw,relatime)
/dev/sda1 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=winnt,errors=remount-ro)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,seclabel,size=786680k,mode=700,uid=1000,gid=1000)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
/dev/sda3 on /run/media/handra/Windows type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096)
[root@GALAXY handra]# 

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

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes, 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: gpt
Disk identifier: 4A3857DE-4871-41AA-8C39-F50E12090FF2


#         Start          End    Size  Type            Name
 1         2048       534527    260M  EFI System      EFI System Partition
 2       534528       567295     16M  Microsoft reser Microsoft reserved partition
 3       567296   1438228479  685.5G  Microsoft basic Basic data partition
 4   1438228480   1857660120    200G  Microsoft basic Basic data partition
 5   1857660928   1910089727     25G  Microsoft basic Basic data partition
 6   1910089728   1912137727   1000M  Windows recover Basic data partition
 7   1912137728   1951475711   18.8G  Windows recover Basic data partition
 8   1951475712   1953523711   1000M  unknown         Basic data partition
[root@GALAXY handra]# 

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[root@GALAXY handra]# ls /boot/efi/EFI
BOOT  centos
[root@GALAXY handra]# 

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[root@GALAXY handra]# efibootmgr -v
BootCurrent: 0005
Timeout: 0 seconds
BootOrder: 0002,0005,2003,0006,2001,2002
Boot0000* EFI Network 0 for IPv4 (50-7B-9D-D4-75-D8) 	PciRoot(0x0)/Pci(0x1c,0x0)/Pci(0x0,0x0)/MAC(507b9dd475d8,0)/IPv4(0.0.0.0:0<->0.0.0.0:0,0,0)RC
Boot0001* EFI Network 0 for IPv6 (50-7B-9D-D4-75-D8) 	PciRoot(0x0)/Pci(0x1c,0x0)/Pci(0x0,0x0)/MAC(507b9dd475d8,0)/IPv6([::]:<->[::]:,0,0)RC
Boot0002* EFI Hard Drive (ST1000LM024 HN-M101MBB)	PciRoot(0x0)/Pci(0x17,0x0)/Sata(0,0,0)/HD(1,GPT,827bfffd-7e73-4368-9005-d104a67f6da0,0x800,0x82000)RC
Boot0005* CentOS	HD(1,GPT,827bfffd-7e73-4368-9005-d104a67f6da0,0x800,0x82000)/File(\EFI\centos\shimx64.efi)
Boot0006* Lenovo Recovery System	HD(8,GPT,6c97784e-acf6-4518-8cb8-05328cabbce2,0x74512800,0x1f4000)/File(\EFI\Microsoft\Boot\LrsBootMgr.efi)RC
Boot2001* EFI USB Device	RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC
[root@GALAXY handra]# 

owl102
Posts: 307
Joined: 2014/06/10 19:13:41

Re: Windows 10 not recognised

Post by owl102 » 2018/01/20 11:04:56

handra wrote:I think I did choose to reformat this partition. I guess that causes quite a mess?
The ESP (EFI System Partition) contains all the bootloaders. The ESP is the (U)EFI-replacement of the MBR, at least regarding the boot loader. So by reformatting it, you have erased the Windows bootloader.
In fact, when I tried to perform automatic recovery using Windows recovery disk, it failed to fix the boot :(
But it should be able to fix it. It's only the bootloader which is missing.

Unfortunately I have never done this myself, but there are several threads in this forum with exact this problem: The ESP was re-formatted during installation. And the problem was solved by using the Windows repair function. Try to find these threads, hopefully, they will help you, too.

BTW: Do you have some kind of backup of the ESP?

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[root@GALAXY handra]# ls /boot/efi/EFI
BOOT  centos
Yes, the Microsoft Windows bootloader is definitely missing in the ESP.

The rest looks fine.

handra
Posts: 4
Joined: 2018/01/19 15:08:38

Re: Windows 10 not recognised

Post by handra » 2018/01/20 11:09:48

BTW: Do you have some kind of backup of the ESP?
I unfortunately do not have any backup on the ESP.
Unfortunately I have never done this myself, but there are several threads in this forum with exact this problem: The ESP was re-formatted during installation. And the problem was solved by using the Windows repair function. Try to find these threads, hopefully, they will help you, too.
Alright, I will try to look for that.

Thanks

owl102
Posts: 307
Joined: 2014/06/10 19:13:41

Re: Windows 10 not recognised

Post by owl102 » 2018/01/21 11:33:19

handra wrote: Alright, I will try to look for that.
These are the ones I just found:

viewtopic.php?f=47&t=64199
"Since you mentioned the Win8 repair might not kill grub, I ran that repair and was able to boot to windows using the UFI boot menu."

viewtopic.php?f=47&t=63655

http://www.dell.com/support/article/de/ ... pc?lang=en
(These instructions should be valid for non-Dell computers, too.)

Hope this helps.

handra
Posts: 4
Joined: 2018/01/19 15:08:38

Re: Windows 10 not recognised

Post by handra » 2018/01/21 11:45:26

owl102 wrote:
handra wrote: Alright, I will try to look for that.
These are the ones I just found:

viewtopic.php?f=47&t=64199
"Since you mentioned the Win8 repair might not kill grub, I ran that repair and was able to boot to windows using the UFI boot menu."

viewtopic.php?f=47&t=63655

http://www.dell.com/support/article/de/ ... pc?lang=en
(These instructions should be valid for non-Dell computers, too.)

Hope this helps.
Thanks a lot. Will sure give it a try after re-creating my USB Windows Recovery Disk.

Cheers

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