Hi @doktor5000,
Hi there, not sure which record you're referring to.
When Mageia is installed, the bootloader generate an entry in the bios for the UEFI.
This will be lost if you disconnect the disk.
Your UEFI contains pointers to the boot devices containing a UEFI bootloader binary. That bootloader binary is located below /boot/efi on disk, so it's already stored there.
You can show the UEFI pointers with efibootmgr, have a look at e.g. at
https://wiki.archlinux.org/title/EFISTUB#efibootmgr
Yes, I have read it, but that is to generate an entry point in the grub menu, right?
I am talking about the entry in the bios to select it as the first boot disk.
Sorry if I explained wrong.
Why do you disconnect the disk in the first place regularly ?
Well, the PC is in a place where there is a lot of dust (it is inevitable) and I clean it every 3 or 4 months, taking everything apart.
There my problem begins.
You may need to take a look at your UEFI settings on how to workaround that.
On the PC I have 3HDs, osx, win$ and mageia. Each of them was installed separately.
The only one that is not recognized in the bios when I reconnect everything is that of mageia
thanks for your help