Windows 8/10 dual boot problems with booting to the secondary system

Hi, I installed Windows 10 as clean OS beside of existing Windows 8.1 installation as secondary OS to second physical drive. When booting to Win 8, everything works fine but when booting Windows 10, I get the error screen shown below. The weird on it is that everything is at it's place since when I press Escape on this screen, it takes me to BIOS, which I exit without saving and after reboot I already can normally boot to Windows 10. After restarting from whichever Windows the situation repeats. At least I can boot to 10 with the described workaround, but I want to fix this annoying issue. I'm just thinking that after BIOS exit the volumes table may be for some while different than in Windows. I even tried to re-add the boot menu entry for 10 from Win8 session but is the same, so the boot entry is correct. Any idea what's wrong?




Just for case the BCD config is this:

Code:

Windows Boot Manager
--------------------
identifier              {bootmgr}
device                  partition=\Device\HarddiskVolume2
path                    \EFI\Microsoft\Boot\bootmgfw.efi
description             Windows Boot Manager
locale                  en-us
inherit                 {globalsettings}
default                 {current}
resumeobject            {ac05b954-fe31-11e8-ae14-ef9370ccff74}
displayorder            {current}
                        {ac05b955-fe31-11e8-ae14-ef9370ccff74}
toolsdisplayorder       {memdiag}
timeout                 15

Windows Boot Loader
-------------------
identifier              {current}
device                  partition=C:
path                    \Windows\system32\winload.efi
description             Windows 8.1 Enterprise 64-bit
locale                  en-us
inherit                 {bootloadersettings}
badmemoryaccess         Yes
isolatedcontext         Yes
allowedinmemorysettings 0x15000075
osdevice                partition=C:
systemroot              \Windows
resumeobject            {601b1f5d-e1a1-11e8-87b9-54bef771218b}
nx                      OptIn
bootmenupolicy          Legacy
detecthal               Yes
quietboot               No

Windows Boot Loader
-------------------
identifier              {ac05b955-fe31-11e8-ae14-ef9370ccff74}
device                  partition=\Device\HarddiskVolume8
path                    \Windows\system32\winload.efi
description             Windows 10 Enterprise 64-bit
locale                  en-us
inherit                 {bootloadersettings}
isolatedcontext         Yes
allowedinmemorysettings 0x15000075
osdevice                partition=\Device\HarddiskVolume8
systemroot              \Windows
resumeobject            {ac05b954-fe31-11e8-ae14-ef9370ccff74}
nx                      OptIn
bootmenupolicy          Legacy

I notice you are running enterprise versions of Windows. How are you activating the enterprise versions?

That's because the screenshoot was removed, someone doesn't like Google Drive?
Trying to post it again.



If I list volumes, the actual partition with W10 installation is identified as Volume 6, but bcdboot A:\Windows clearly adds Volume8 which comes weird too.

Exact volumes list as provided with Diskpart:

Code:

DISKPART> list volume

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0     N                       DVD-ROM         0 B  No Media
  Volume 1     C   Windows 8.1  NTFS   Partition    256 GB  Healthy    Boot
  Volume 2     D   Apps         NTFS   Partition    176 GB  Healthy
  Volume 3                      RAW    Partition     32 GB  Healthy
  Volume 4         System       NTFS   Partition   1024 MB  Healthy    Hidden
  Volume 5                      FAT32  Partition    100 MB  Healthy    System
  Volume 6     A   Windows 10   NTFS   Partition    141 GB  Healthy
  Volume 7     S   WinPageFile  NTFS   Partition     12 GB  Healthy    Pagefile
  Volume 8                      RAW    Partition     96 GB  Healthy
  Volume 9                      RAW    Partition     32 GB  Healthy
  Volume 10                     RAW    Partition    417 GB  Healthy
  Volume 11    Z   Backup 2     NTFS   Partition   1088 GB  Healthy
  Volume 12    H   Data 2       NTFS   Partition   2638 GB  Healthy
  Volume 13    I   Data 3       NTFS   Partition   1365 GB  Healthy
  Volume 14                     RAW    Partition     32 GB  Healthy
  Volume 15    J   PORTABLES    FAT32  Partition     20 GB  Healthy
  Volume 16    Y   Backup 1     NTFS   Partition     95 GB  Healthy
  Volume 17    G   Data 1       NTFS   Partition   1280 GB  Healthy

You didn't answer how your Windows 10 Enterprise is activated. And also the associated question of where did you obtain Windows Enterprise from?

Maybe HW problem (improper disk init). Try to connect your win10 disk to different sata port.

There's no choice of other SATA port as it's laptop. To boot from second drive it's always required to enter BIOS first to refresh the volumes table. As the secondary OS is seldom used it's not such a big issue, but I anyway want to get clue why after exiting whichever Windows session volumes mapping is changed or even all drives except first HDD are not visible. So yes, it may be HW failure, or BIOS failure, but so far no metrics for that. An option of boot logging would help.

As the issue emerges before OS start, there are a few options only, including:
- physically exchange two disks
- different bios version
- some change of bios settings (secure boot, boot order...)
- test different hdd/ssd
- placing both systems at first hdd.

Boot logging:
Enable or Disable Boot Log in Windows | Tutorials

If Windows 10 is second, you should set hard disk priority in BIOS so the disk with Windows 8 is first followed by the disk with Windows 10. Then boot with Windows 10 DVD or USB and do a startup repair to fix any booting issues.