@ThomasMann You obviously have done a mistake while trying to get a dual-boot system with the option either to boot Win7 or Win11. That is the reason why this partition is listed separately by the Disk Management. It seems, that the formerly created 100 MB sized EFI Boot Partition of your 500 GB Disk Drive has been destroyed (by formatting it?), whereas the 100 MB sized EFI Boot Partition, which is on your 250 GB sized SSD, is still ok, but got a separate letter D and lost the connection to your Win11 installation. You are mixing up the terms "Disk" and "Partition". There can be more than 1 partition on a single disk. Solution: a) Reparation of the Windows Boot Manager (e.g. by the tool EasyBCD) b) Formatting both disk drives and doing a fresh installation of both Windows Operating Systems (in the correct order)
Thank you, so far so good... After the repair with easyBCD, the Win11 can be bootet again and works totally normal. But the separated partition is still there. Is that part actually needed? Even easyBCD did not even see it... I could use Macrium to only copy the functioning part to another disk...? Also, I have a 4TB HDD installed and while the win7 installation recognizes it, the win11 does not. Will that problem be gone once I re-install win11?
@Fernando1 Friday Evening... I have spent most of the day doing everything you recommended, but, basically, I am right back where I started. Maybe I have asked the wrong question.... I have three discs in my desktop. One SSD with a newly installed Win7, one SSD with a newly installed Win11, and a 4TB HDD for storage. My idea is that I access the data on the other discs from Win11, as I can do from the Win7 SSD. But Win11 shows me only one disc, itself... On top of that, my old friend the 99 MB partition has turned up again... And the main problem is, that if want Win7, I have to disconnct the Win11 disc, and the other way around. If I want anything from anothert disc, i have to disconnect the one and connect the other, copy the item on a USB stick and transfer it, to where I want to use it...
Yes, we all know you are brilliant and i am an idiot.... You will have to forgive me, if i do not feel like listing here all the things I did.. and btw your easyBCD does not work every first time...
Thank you. All I actually do need now, would be to get access to ALL other disks, from the one I booted and use. Win11 and Win7 seem not like to get together. Maybe that is normal?
If you are not using UEFI to share Dual boot with Windows 7 and Windows 11, you can use EasyBCD, be sure you backup first on EasyBCD!! If you are using UEFI with Windows 7 and Windows 11, I suggest look for Hasleo EasyUEFI it really works! Also there other tools are freeware use edit UEFI table.. BTW, what CPU are you using now?? just asking?? ATGPUD2003
Boot ONE OS, possibly the newest one you have. Follow what's @EXO56 said above, (if you are scared by the bcdboot command line.) Once you have one OS booted just use bootice and add all the others. (obviously set the bootloader in legacy mode no matter if you have one or 15 oses). All the matter is deadly simple today, is not like the days you wanted to boot DOS, Win95, OS2 and Linux all from a single place, which was matter for really experienced users.
So, no different than frying an a egg Aside that I suggested bootice, not easybcd, once you have suggestions yo know that you search on duckduckgo. This is how you learn things, at least this is how humanity learn to do things, since internet is available. Being spponed on every detail may be effective *once*, then the next time you need to change something you are in troubles again this is something you do from the bios, whatever bootice has a uefi section that allows you to set the boot disk order from the gui. set it to your liking, reboot and forget it, the bootmanager is a different thing, that's what you need to setup to do multiple boot w/o touching the bios further.
Likely you (or your mobo) are confused because you're mixing mbr and gpt disks. So, please explain how your hdds are initialized, and how the csm option is configured in your bios.
I believe the UEFI issues because I have Windows 7 and 11 to work just fine on my ASUS motherboard or MSI laptop.. ATGPUD2003
Of course they are mixed, I assume that this is the only way they can be installed... ? Before I go foreward and backward again a dozne times, how should the csm be set on my AS rock motherboard? If I have understood CSM correctly, it needs to be disabled when installing Win11? If it is disabled will that work with Win7? "...please explain how your hdds are initialized,..." There is only one HDD, and that is storage and non-bootable, and what do you mean by "initialized" ?
"Of course" absolutely not. using GPT partitions when your mobo still supports the MBR ones is looking for troubles. So Option 1: look at your bios, it should have an option to boot from GPT/GUID partitions only MBR only, or both. Choose the first one so *only* the W11 disk will be bootable (and it will boot) Then use bootice to add the other OS to the (win11) bootloader. Option 2: convert your Win11 disk (and other GPT disks) to MBR (easeus disk manager can do that in seconds). Set the partitions to active, install the bootloader in mbr mode on any affected disk. This way any disk will be bootable from the bios boot popup, then decide which OS you want to start first, then configure the bootloader of that disk adding the other OSes Option 3: Forget partitions, forget setup, forget ISOs, and learn to deploy on VHD/VHDX as everyone should do in 2024. Boot from one physical disk, to many VHD/VHDX, no matter where they reside, no matter if the physical disk is GPT or MBR, no matter if the VHDs are gpt or mbr. Win11 works from MBR w/o any problem, maybe the recent installers try to force you to use GPT disks, just don't use the setup, pretty simple.