cant see Windows 10 on grub screen at the beginning.

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Cagatay
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Joined: 2017/09/17 18:37:32

cant see Windows 10 on grub screen at the beginning.

Postby Cagatay » 2017/09/17 18:51:23

I have just install Centos 7. I cant see Windows 10 on grub screen at the beginning. Please help.

hunter86_bg
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Re: cant see Windows 10 on grub screen at the beginning.

Postby hunter86_bg » 2017/09/18 07:15:27

Did you install CentOS in UEFI mode? Is Win10 in UEFI mode too?

Cagatay
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Joined: 2017/09/17 18:37:32

Re: cant see Windows 10 on grub screen at the beginning.

Postby Cagatay » 2017/09/18 09:34:49

Yes, both Centos 7 and Windows 10 are installed in UEFI mode.

hunter86_bg
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Re: cant see Windows 10 on grub screen at the beginning.

Postby hunter86_bg » 2017/09/18 15:01:19

When you start the machine and press the F9 (could be different) - the boot menu for the bios , is there an entry for windows and CentOs, or just CentOS?
If your need your windows urgently, you can run the windows dvd and select repair.

Cagatay
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Joined: 2017/09/17 18:37:32

Re: cant see Windows 10 on grub screen at the beginning.

Postby Cagatay » 2017/09/18 15:23:13

I can see just CentOS. I tried to repair Windows but it didn't work.

hunter86_bg
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Re: cant see Windows 10 on grub screen at the beginning.

Postby hunter86_bg » 2017/09/20 05:31:27

Check the following thread , it might give you a clue how to fix it:
https://www.centos.org/forums/viewtopic.php?f=47&t=64199

owl102
Posts: 272
Joined: 2014/06/10 19:13:41

Re: cant see Windows 10 on grub screen at the beginning.

Postby owl102 » 2017/09/20 07:34:31

Please give us the output of the following three commands (executed as root):

Code: Select all

os-prober
ls /boot/efi/EFI
efibootmgr -v

Cagatay
Posts: 11
Joined: 2017/09/17 18:37:32

Re: cant see Windows 10 on grub screen at the beginning.

Postby Cagatay » 2017/09/20 11:25:09

I think Windows 10 is deleted when I try to install Centos 7 again and again. I cant see Windows 10 in folder, other locations.
owl102 wrote:Please give us the output of the following three commands (executed as root):

Code: Select all

os-prober
ls /boot/efi/EFI
efibootmgr -v

[root@localhost cagatayemre]# os-prober

[root@localhost cagatayemre]# ls /boot/efi/EFI

BOOT centos

[root@localhost cagatayemre]# efibootmgr -v
BootCurrent: 0002
Timeout: 0 seconds
BootOrder: 0002,3002,0000,2002,2001,2004
Boot0000* EFI Hard Drive (TOSHIBA MQ02ABD100H) PciRoot(0x0)/Pci(0x17,0x0)/Sata(0,0,0)/HD(1,GPT,6f48cf6d-6c6a-4515-87e5-fb4279616f48,0x800,0x64000)RC
Boot0001* Internal CD/DVD ROM Drive (UEFI) (hp DVDRW GUE1N) PciRoot(0x0)/Pci(0x17,0x0)/Sata(1,0,0)/CDROM(1,0x244,0x4638)RC
Boot0002* CentOS HD(1,GPT,6f48cf6d-6c6a-4515-87e5-fb4279616f48,0x800,0x64000)/File(\EFI\centos\shimx64.efi)
Boot2001* EFI USB Device RC
Boot2002* EFI DVD/CDROM RC
Boot3002* Internal Hard Disk or Solid State Disk RC
[root@localhost cagatayemre]#

Cagatay
Posts: 11
Joined: 2017/09/17 18:37:32

Re: cant see Windows 10 on grub screen at the beginning.

Postby Cagatay » 2017/09/20 11:29:29

hunter86_bg wrote:Check the following thread , it might give you a clue how to fix it:
https://www.centos.org/forums/viewtopic.php?f=47&t=64199

Okay thank you for your help.

owl102
Posts: 272
Joined: 2014/06/10 19:13:41

Re: cant see Windows 10 on grub screen at the beginning.

Postby owl102 » 2017/09/20 12:06:37

Cagatay wrote:BOOT centos

Yes, same as in viewtopic.php?f=47&t=64199 . The UEFI boot entry is there but no folder called /boot/efi/EFI/Microsoft containing the MS-Windows EFI boot loader, so you have accidentally advised the CentOS installer to re-format the EFI System Partition (ESP).

Restoring the MS-Windows boot loader should help.

BTW: Since this seems to happen quite often to people I would recommend a change in Anaconda: If a user ticks "[ ] format" on /boot/efi, it should raise a warning message that this is usually not necessary and especially will wipe out other, already existing EFI boot loaders.