No boot partition on boot drive after clean install with 2nd drive

Hey all,

It's an age old story, probably..

I was running Win7. Had a crash that munged me being able to boot and I have never had success creating a repair disk for 7 with USB3 drivers (I'm on Z170 chipset). So I decided I should finally jump into Win10 as I reserved my digital entitlement during the free period.

So I did a fresh install on a freshly cleared SSD, but stupidly did not remove my Win 7 SSD before doing so. Now Windows 10 is using the boot partition on that drive and did not create one on it's own volume. I get the "Select OS" screen, although booting into 7 does not work.

What's the best practice here for creating what Win10 needs on the boot volume so I can wipe the other SSD? (Or if someone knows how I can get the boot volume on the Win10 drive and fix my Win7, that would be the perfect world)

Diskpart info:

SSD with Win 10 -

Partition ### Type Size Offset
------------- ---------------- ------- -------
Partition 1 Reserved 16 MB 1024 KB
Partition 2 Primary 931 GB 17 MB

SSD with Win 7 -

Partition ### Type Size Offset
------------- ---------------- ------- -------
Partition 1 System 100 MB 1024 KB
Partition 2 Reserved 128 MB 101 MB
Partition 3 Primary 465 GB 229 MB

Other info: I have a bootable Win 10 USB install disk. I also have a bootable Macrium Reflect Free USB stick. I believe I also have an Acronis Recovery USB stick.

I have a spare HDD for cloning my Win 10 install if needed. I'd like to avoid just starting over as I only discovered my error after I fully configured Windows and installed all my apps and migrated data.

Any help is greatly appreciated,

-D

Attached is the current partition scheme.

Attachment 146103

So it sounds like you're saying:

Clone the current 10 install so I have a backup.
Disconnect everything except the drive I want 10 on
Install 10 fresh and boot in
Clone my backup back on to the disk effectively wiping the fresh install
Run startup repair

Yes, I know I'm basically repeating what you said in my own words.. but I wanna make sure I got it don't muck it up.

Thanks!

The attachment is invalid. If you do a clean install then restore an iamge your back to square one

Sorry about the bad attachment. Trying again.

And again, thanks for the help guys. I will clone my current install overnight.

I would try doing an image of the efi parition and boot sector shrink c to the right then clone the image to the free space so you have ufi parition drr if it boot if not then do a repair

dalchina said:

Nonetheless, I will post again a procedure which should allow you to recover your Win 10 configuration.
1. Use disk imaging (Macrium Reflect (free) or similar) of your Win 10 'C:' only.
2. Wipe the disk on which Win 10 is.
3. Remove the Win 7 disk (and disconnect any others to be 100% safe if you wish)
4. Reinstall Win 10
5. Make sure it boots.
6. Replace the new 'C:' partition by restoring the image you created.
7. Boot from a Win 10 install disk and run Startup Repair

This worked. I truly appreciate the help.