Acemagic RX16 (AMD Ryzen 9 6900HX) : interoperability between Ubuntu 24.04 and Windows 11 in dual boot

[GRTN]

In previous POST “Acemagic RX16 (AMD Ryzen 9 6900HX) : dual boot Ubuntu 24.04 + Windows 11” allows to keep Windows 11 and Ubuntu 24.04 separated , but I didn’t mention the fact that dual boot doesn’t compel complete separation .
I didn’t mention that after standard installation of Ubuntu 24.04 the free single volume initialized on 2 TB NVMe SSD was partitioned in 4 volumes : first tiny partition of 16 MB reserved to Microsoft , second partition of only 1 GB for UEFI , third partition of 385.1 GB for interoperability between Microsoft and Linux , fourth partition of 1.5 TB for Linux files system .
First two partitions are non-accessible by user , but the two major ones of 385.1 GB and 1.5 TB are both accessible in Ubuntu 24.04 .
The 1.5 TB partition is mounted as “/” , that means “root” of Linux file system . The 385.1 GB is mounted as if it were an external additional storage device with label “Ubuntu Volume” , it can be accessed on Ubuntu desktop under label “Other Locations” or by terminal on path “/media/<user id>/Ubuntu\ Volume/” .
“Ubuntu Volume” is accessible also on Windows 11 , where it is mounted as “D:” : so it can be used to share files among both operating systems .
But it is also available volume of 474.8 GB with all files created by user on “C:” of Windows 11 , on original SSD of 512 GB installed on Acemagic RX16 , in Ubuntu 24.04 as if it were an additional storage device : on Ubuntu terminal "C:" can be accessed as “/media/<user id>/<label>” .
Below all checks that can be done on Ubuntu 24.04 terminal :

sudo fdisk -l
...
Disk /dev/nvme0n1: 1.86 TiB, 2048408248320 bytes, 4000797360 sectors
…
Device Start End Sectors Size Type
/dev/nvme0n1p1 34 32767 32734 16M Microsoft reserved
/dev/nvme0n1p2 32768 807573503 807540736 385.1G Microsoft basic data
/dev/nvme0n1p3 807573504 809775103 2201600 1G EFI System
/dev/nvme0n1p4 809775104 4000794623 3191019520 1.5T Linux filesystem
…
Disk /dev/nvme1n1: 476.94 GiB, 512110190592 bytes, 1000215216 sectors
...
Device Start End Sectors Size Type
/dev/nvme1n1p1 2048 206847 204800 100M EFI System
/dev/nvme1n1p2 206848 468991 262144 128M Microsoft reserved
/dev/nvme1n1p3 468992 996276223 995807232 474.8G Microsoft basic data
/dev/nvme1n1p4 996276224 1000214527 3938304 1.9G Windows recovery environment

lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL /dev/nvme0n1p1
NAME FSTYPE SIZE MOUNTPOINT LABEL
nvme0n1p1 16M

lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL /dev/nvme0n1p2
NAME FSTYPE SIZE MOUNTPOINT LABEL
nvme0n1p2 ntfs 385.1G Ubuntu Volume

lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL /dev/nvme0n1p3
NAME FSTYPE SIZE MOUNTPOIN LABEL
nvme0n1p3 vfat 1G /boot/efi

lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL /dev/nvme0n1p4
NAME FSTYPE SIZE M LABEL
nvme0n1p4 ext4 1.5T /

lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL /dev/nvme1n1p3
NAME FSTYPE SIZE MOUNTPOINT LABEL
nvme1n1p3 ntfs 474.8G /media/<user id>/<label>