Jay__Sam wrote:
Why every time I try to make an Installation of MacOs Catalina it happens to appear the Macintosh-data partition to be there after the installation and if I try to go back to the recovery model and delete the Macintosh-data partition the system wont boot..?
If you correctly install the macOS you would expect to see Macintosh HD and Macintosh HD - Data.
From the Terminal you can see the drive structure here:
diskutil list internal
for example only—Catalina
MacBook-Pro ~ % diskutil list internal
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 314.6 MB disk0s1
2: Apple_APFS Container disk1 1.0 TB disk0s2
/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +1.0 TB disk1
Physical Store disk0s2
1: APFS Volume Macintosh HD 11.2 GB disk1s1
2: APFS Volume Macintosh HD - Data 273.7 GB disk1s2
3: APFS Volume Preboot 80.8 MB disk1s3
4: APFS Volume Recovery 529.0 MB disk1s4
5: APFS Volume VM 3.2 GB disk1s5
Under the the new APFS all Volumes share space within the Container without penalty.
https://support.apple.com/guide/disk-utility/add-erase-or-delete-apfs-volumes-dskua9e6a110/mac