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Windows 7: Dual boot - not

2 Weeks Ago   #1
Orcadian

Windows 7 Pro 64 bit and Windows 10 Pro 64 bit
 
 
Dual boot not working

I have a 6-year-old Dell PC with Windows 7 on the hard drive. This drive has been disconnected until recently.

I also have an SDD with two partitions. The first partition contained a second (activated) instance of Windows 7, loaded while the SSD was in one of the HDDn slots.

With the SSD in HDD3, I then attempted to upgrade to Windows 10, using various methods - but they all bombed with "Installation failed in SAFE_OS phase with an error during BOOT operation".

Eventually I chanced across a suggestion to 'try the DVD connector', SATA0. And, miraculously, this worked. At least one of my installation attempts had left a copy of W10 somewhere, and with the SSD on SATA0 I was suddenly offered a Windows 10 boot. I was able to complete setup and activate Windows 10 using the Windows 7 key.

I then reconnected the hard drive containing my original Windows 7. My aim was to achieve a dual-boot system: Windows 7 (loaded with software) for work, and Windows 10 for my own use. But as the attached table shows, dual boot is not working.

Does anyone have a fix for this?

BIOS reports that:

- Boot options are set to Legacy (i.e. not UEFI)

- AHCI operation is enabled ("affects SATA drives only")

- SATA/RAID operation is enabled ("affects connectors HDD0 - HDD3 and SAS0 and SAS1 only")
(When I disabled RAID, as an experiment, the BIOS was unable to boot from either disk.)

- Optional boot sequence is enabled, though I only discovered this setting after both O/S's has been installed.

Thanks!




Attached Images
Dual boot - not-disk-visibility.jpg 
My System SpecsSystem Spec
.
2 Weeks Ago   #2
Megahertz07

Windows 7 HP 64
 
 

First rule is to disconnect ALL other drives (SATA or power cable) from MB.
Download the Win 10 iso and extract all files and folders to a folder (My suggestion is to use 7zip)
If you have a Antivirus, disable it. Run setup from running Win 7.
My System SpecsSystem Spec
2 Weeks Ago   #3
SIW2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64
 
 

Post a screenshot of disk management.
My System SpecsSystem Spec
.

2 Weeks Ago   #4
Orcadian

Windows 7 Pro 64 bit and Windows 10 Pro 64 bit
 
 

Quote   Quote: Originally Posted by Megahertz07 View Post
First rule is to disconnect ALL other drives (SATA or power cable) from MB.
Download the Win 10 iso and extract all files and folders to a folder ... Run setup from running Win 7.
Thanks, Megahertz07.. But as described, both O/S's are already installed. What I am looking for, ideally, is a way of fixing the problem without reinstalling.
My System SpecsSystem Spec
2 Weeks Ago   #5
SIW2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64
 
 

disk management screenshot?
My System SpecsSystem Spec
2 Weeks Ago   #6
Orcadian

Windows 7 Pro 64 bit and Windows 10 Pro 64 bit
 
 

Quote   Quote: Originally Posted by SIW2 View Post
Post a screenshot of disk management.
Hi SIW2. Attached is the view from:

- Windows 10 (with the SSD on SATA1 - will not boot otherwise)
- Windows 7 with the SSD on HDD3
- Windows 7 with the SSD on SATA1

(Apologies; these thumbs appear to have reordered themselves! Let me know if it's not clear which is which, and I will annotate them later this evening.)


Attached Thumbnails
Dual boot - not-w10-disks-ssd-sata1-6.1.20.jpg   Dual boot - not-w7-disk-mgr-ssd-hdd3.jpg   Dual boot - not-w7-disk-mgr-ssd-sata1.jpg  
My System SpecsSystem Spec
2 Weeks Ago   #7
Volume Z

Windows 7 Home Premium
 
 

From within Windows 7 (OS W7) and with both drives attached, run cmd.exe as an administrator and execute

bcdboot E:\Windows

Regards, VZ
My System SpecsSystem Spec
.
2 Weeks Ago   #8
Orcadian

Windows 7 Pro 64 bit and Windows 10 Pro 64 bit
 
 

Quote   Quote: Originally Posted by Volume Z View Post
From within Windows 7 (OS W7) and with both drives attached, run cmd.exe as an administrator and execute

bcdboot E:\Windows

Regards, VZ
I have now tried VZ's suggestion. Immediate consequence was that neither Windows 10 nor Windows 7 would boot, as Boot Mgr could not find any O/S. That was a little frightening but on a second try it managed to find the original W7 boot loader. Phew!

Both BL's are there; see attached screenshot of bcdedit /enum - and at bootup I am offered either W7 or W10. But Windows 10 (on HDD3) still will not boot. The W10 logo screen appears, the wheel spins for a while - then I get a failure screen, also attached.

I went into Recovery and opened a CMD window. DISKPART finds no disks - not even a system disk. Yet i can browse to a boot disk called X:\ - listing of contents attached. I am perplexed.


Attached Thumbnails
Dual boot - not-w10-ran-into-problem.jpg   Dual boot - not-diskpart-finds-no-disks.jpg   Dual boot - not-contents-disk-x.jpg  
Attached Images
Dual boot - not-bcdedit-enum-cmd-.jpg 
My System SpecsSystem Spec
2 Weeks Ago   #9
SIW2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64
 
 

X is in RAM , it is the scratchspace for the booted winpe ( or winre )

Try cmd prompt type:

diskpart
(then press enter)
lis dis
(then press enter)
sel disk 1
(then press enter)

or you could do

diskpart
(then press enter)
lis vol
(then press enter)
sel vol ( either the number or the letter)
(then press enter)
My System SpecsSystem Spec
2 Weeks Ago   #10
Megahertz07

Windows 7 HP 64
 
 

You have a big mess on your system with the boot loader on one partition and the OS on another.

Lets try to fix it, one by one.
Let's begin with the original Win 7 disk that came with the computer.
- Detach (SATA or power cable) all other disks from the MB.

Can you boot from the Win 7 disk that came with the computer?
My System SpecsSystem Spec
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 Dual boot - not




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