I wanted to have two systems installed on ososbian SSD drives. I installed Ubuntu twice. The first time, I divided the second SSD into partitions and unnecessarily initialized them in Windows. Because of this, after the first Ubuntu installation, in the "boot option" in bios, the Ubuntu boot option had the first SSD (SX8200PNP) added, so I deleted this partition from windows. I then reinstalled Ubuntu, creating a partition for it in the installation editor. As a result, in the "boot option" Ubuntu boot option had a good disk (Samsung SSD 970) added.
Unfortunately the BIOS still has the old option to boot Ubuntu from the SX8200PNP drive. How to remove it? In addition, in Ubuntu I have access to files and folders that are on the SX8200PNP drive in Windows. Does this mean that I have not separated the two systems 100% from each other? In the picture, I added the result of sudo fdisk -l and the folders that are in Windows, which are visible from Ubuntu.
NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS
nvme0n1
│
├─nvme0n1p1
│ vfat FAT32 28FD-9DDA
├─nvme0n1p2
│
├─nvme0n1p3
│ ntfs D85A0C655A0C432C 112,4G 60% /media/patryk/D85A0C655A0C432C
├─nvme0n1p4
│ ntfs Nowy B6CA94D1CA948F6D 38,1G 80% /media/patryk/Nowy1
└─nvme0n1p5
ntfs 7C38C98838C9423E
nvme1n1
│
├─nvme1n1p1
│
├─nvme1n1p2
│ ntfs Nowy 8E7AD7E47AD7C75D 579,9G 0% /media/patryk/Nowy
├─nvme1n1p3
│ vfat FAT32 7A8D-4979 505,9M 1% /boot/efi
└─nvme1n1p4
ext4 1.0 8b6cf1bc-df1d-4ac5-a597-bb56219d203c 304,6G 2% /var/snap/firefox/common/host-hunspell
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