Solved Can't Create Dual Boot

Ok. I wrote that the problem is not installing on any partition, only the installation must go separately and must make an EFI system partition because later there is a problem in booting windows because it will send you to the bios and then when you pass the bios you will be able to boot other windows even if you have EasyBCD installed . I have enough experience with that until I figured it out.

@obelix I am afraid it means nothing to me, everything was fine until I extended the drive

I wouldn't worry too much about it, mine are different depending in which drive I'm booted into

The-Hive said:

@obelix I am afraid it means nothing to me, everything was fine until I extended the drive

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The method @obelix used was for installing on 3 separate OS's on 3 separate disks completely independent of each other, it's not the same installing to a single disk. Post a screenshot of you diskmgmt

Thanks @CornishRattler It was all the same until I extended the drive or fixed the boot menu, Not bothered as all is working well

CornishRattler said:

The method @obelix used was for installing on 3 separate OS's on 3 separate disks completely independent of each other, it's not the same installing to a single disk. Post a screenshot of you diskmgmt

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Will do, I am on my system 1 now

The-Hive said:

Well this Drive letter thing is strange. I presume it happened when I extended the drive but not sure.
On the C: drive (normal OS) everything has changed from F: to D: However, when I go to the "other" OS it is still the F: drive and everything shows up as F: and D: is the USB port. I wonder if this is worth trying to sort as everything is working well now thanks to you guys

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You can change drive letters to whatever you like from disk management.

Just right click on drive and select option.

The-Hive said:

All sorted (I hope) I uninstalled easybcd, ran Macrium Rescue Disk and fixed the boot error so now it boots to a Blue "Metro" screen and renamed the operating systems from the tutorial. I did expand the size of the drive with Partition Wizard and found that my drives have all been re named, C is still C, F is now D, D is now E and E is now F. That is not a problem, I it's better

Big Thank you to @Wynona @CornishRattler @Fabler2

Next step Backup and back into Dev Channel

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You are quite welcome, @The-Hive. It's good to know my limited knowledge can help someone whom I consider to know lots more than I!

I also like that Windows 11 has progressed to the point that dual booting is now much faster than in Windows 10!

The-Hive said:

Well this Drive letter thing is strange. I presume it happened when I extended the drive but not sure.
On the C: drive (normal OS) everything has changed from F: to D: However, when I go to the "other" OS it is still the F: drive and everything shows up as F: and D: is the USB port. I wonder if this is worth trying to sort as everything is working well now thanks to you guys

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I have one SSD drive and one Data drive on this system. I have partitioned the SSD drive to hold Windows 10 and Windows 11; C:\ and F:\. When I'm in Windows 10, I'm "using" the C:\ drive. When I'm in Windows 11, it tells me I'm using C:\ drive, although it's really F:\. I believe this is done by Microsoft because Windows can only run on the C:\ drive. Of course, I'm guessing here . . .

Wynona said:

I have one SSD drive and one Data drive on this system. I have partitioned the SSD drive to hold Windows 10 and Windows 11; C:\ and F:\. When I'm in Windows 10, I'm "using" the C:\ drive. When I'm in Windows 11, it tells me I'm using C:\ drive, although it's really F:\. I believe this is done by Microsoft because Windows can only run on the C:\ drive. Of course, I'm guessing here . . .

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Drive letters are only allocated at start up of Windows - during boot process, the system uses volume identifiers which are unique.

You are correct that the booted version of full Windows is historically always C (boot drive can have any letter in WinPE mode but normally assigned X).

So when you boot from Windows 11, it is C that is always assigned to the drive with booted OS. Other drives can be assigned different letters depending on situtation.

So same physical drive can be assigned a different letter in each operating system.
All that happens is each OS dynamically assigns next available drive letter.

However each version of Windows remembers the drive letters it assigns. So you jiggle drive letters around until the same drive letter is used on each partition (when booted from each OS). The trick is to use the same drive letter for Windows i.e. you boot into W10 and assign W11 letter D (say), and vice versa when you boot into W11.

Windows can boot and run on a drive other than C:

Although, I don't know why you would want to.

NavyLCDR said:

Windows can boot and run on a drive other than C:

Although, I don't know why you would want to.

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Yeah - I know this is possible but no idea how to do it, or as you say why?

This reminds me of "the good old day" when A and B drives were floppy disks C was the hard drive and D was a cd

The-Hive said:

This reminds me of "the good old day" when A and B drives were floppy disks C was the hard drive and D was a cd

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Surprisingly, Windows 10 (at least) still supports floppy disk drives.

cereberus said:

Surprisingly, Windows 10 (at least) still supports floppy disk drives.

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Which makes me wonder whether the old Zip drives still work. I know they did in Windows 7.

I know they did in 10, so I would assume they would in 11

If possible, please post a new image of disk management and run these scripts for each boot drive letter:
Please post results using share links: one drive, drop box, or google drive.

Windows can get a letter other than C if you install it on another partition or drive when you are in windows.
But, as Navy states, who does this anymore.
Rod, if I have a CD/DVD drive installed, I always change its letter to Z.

This is what an installation with 3 OS on 3 different disks should look like.

A few more problems now that the dual boot is working fine and the Insider dev build .100 installed.
1, I have one of Brinks tweaks to get the ribbon back and it worked fine until the update, now it goes over the first 4 lines
2, Another Tweak to play a sound at Logon, all still there but the logon sound not working, other sounds play fine
3, ExplorerPatcher no longer works as I cannot restart explorer with it installed.

Any Suggestions?