Windows 10: Lost Win10 in Multiboot disk partition Win7, Win10 and LM Rafaela

Hi,
My disk contains 5 partitions:
part1 = ntfs-win10 free upgrade of win home premium (primary)
Part2 = ntfs-win7 home premium (primary)
Part3 = ext3-Extended (logical)
Part4 = ext3-LM rafaela (extended)
Part5 = swap (extended)
This setup worked good.

Part2 win7 got buggered, and reinstalled (nvidia chip-set melt down during win7 boot). The MB was replaced.

I can no longer get to win10 boot Part1. Booting to Part1 or Part2 results to booting the newly installed win7. Rafaela boot did not change: still working.

How can I reclaim my win10 boot? I can't upgrade for free anymore so I'm hoping there's a way to work with what's there.

Thanks,
Keith

:)

 

Power Option "Turn on fast startup (recommended)" --VERY BAD DEFAULT FOR MULTIBOOTERS WITH Win7 or earlier systems on same pc!!!

Turn this shutdown setting option off, or when you do a normal shutdown, the next boot of a win7 or earlier partition will result in a vey time consuming and irritating scan of all the non-win10 partitions on the PC. This will occur every time a "normal"
shutdown is done in win10.

Microsoft, this is a VERY BAD default. At least WARN new windows 10 installers about this multiboot issue!

Just a heads up for new win10 installers.

 

Are there any risks with hiding an inactive OS from the active OS's Explorer?

I have Windows 7 Pro (x64 retail) and Windows 10 Pro (x64 OEM) in a multiboot state.

Windows 7 (which I installed first) is on a hybrid SATA 3.0 drive, and Windows 10 (installed while my Windows 7 drive was still connected) is on an mSATA SSD in a PCI-Express card. The Win10 dual-boot screen prompts me to choose which OS to boot.

At the moment, with Windows 10 as my active OS (C:), my Win7 drive is labeled
F: There is a System Reserved partition (100MB) for Win7, but none for Win10 (usually 500MB if installed as a stand-alone OS).

Likewise, in Windows 7 (C:), my Win10 drive is labeled
F:

If I were to remove the drive letter from my inactive OS, so that the drive would not be visible in the Explorer (that is, my Win7 drive would be invisible in my Win10 Explorer, and my Win10 drive invisible in my Win7 Explorer), would I run the risk of a
system crash upon booting either one of my operating systems? Would Win7 still appear as an option in the Win10 dual-boot screen?

By the way, in my multiboot setup, Win10 did not create a System Reserved partition (usually 500MB) upon installation. Is Win10 using the
System Reserved partition (100MB) created by my Win7 installation? Should I increase the size of this partition to 500MB or even 600MB, to account for the files that might be stored there by both operating systems?

 

You could use EasyBCD to add Win10 to the boot code.
EasyBCD Documentation

Take care not to screw up the Linux entry.
I'm pretty sure EasyBCD makes a backup - but it's been quite a while.

Read first, plan 2nd, backup the BCD store - then execute the plan

 

Hi,
easybcd has been in use. It does allow you to alter win7 boot loader simply. The problem is that once win7 was re-installed on part2 it took over the boot loader that win10 made/altered during its upgrade.
On boot there are 3 choices Win7, Win10, Rafaela. Both win7 and win10 boot to the newly installed win7. Rafaela boots as before.
I need to direct win10 boot to part1. Part1 has not changed since the re-install of win7 on part2. It's just the boot loader that did. easybcd doesn't doesn't make one it manipulates loaders but doesn't generate them.
Thanks,
Keith


Did not see tab to post again to this thread so I edited my last post:

I want win10 so I took a shot at below:
win10 partition (part1) copied d:\Windows\Boot to d:
copied d:\Windows\Boot\PCAT\bootmgr to d:
This file and folder were never at root (d*Smile before
made part1 (win10 part) active in boot manager
re-started

Got Blue screen that read: there is a problem with set up and I think the only option was to shut down.

I used gparted standalone to make win7-part2 boot drive or active in windows terms.

I back to my first post - win7 and win10 boot selections boot to win7 , rafalea boots ok

I removed copied files from d: and over wrote bootmgr in c: drive to it's former self. It was a copy of win10's Windows\Boot\PCAT\bootmgr: as suggested in this post.

I don't know what to do so I will wait till there's another direction.

Thanks,
Keith

ANSWER is on another post (here). <cmd> BCDBOOT D:\Windows

 

Win10+Win7 dual boot issue - Windows 10 Forums