windows update to 1909 loses healthy disk

Greetings
I waited for a very long time to (years!) update from 1809 to 1909.
I even asked in this form why the offer to update to 1909 doesn't come normally, and the explanation was that some programs on my pc were incompatible with 1909.
Yesterday it finally came only to discover that my 6TB disk (my 3rd disk) was missing.
Control panel administrative tools declared it to be uninitialized and suggested initialization by MBR and GPT.
As I remembered I used GPT but choosing this option yielded another window that GPT was not recognized by windows.
I don't know if things got better in 2004, but I'm surprised.
I'm not sure if initializing is harmless or I lose all my data, anyway it is not normal, since I rolled back to 1809 where this 6TB disk is regarded in administrative tools as NTFS healthy.
Any harmless solution that won't result in losing my data on the 6TB disk?
besides icons on tray and quick link became too small for me. This should be easier but I couldn't find it in settings of taskbar
thank you

thank you for your prompt answer
I'm not familiar with the sentinel but will do as you suggest
I just hope it won't do anything without asking me.
This 6TB contains music. excerpts from my disk library and internet sources like youtube etc.
Hence I address it all the time and it never gave me any trouble.
it does not have a backup yet.
I don't remember if I used minitools partition wizard anyway I don't understand why a move from 1809 to 1909 will need initialization I have 2 and 3TB disks that remained as they were in 1809 but they were formatted normally as NTFS
my graphic card on board intel (the board is gigabyte z87)

at last I ran Sentinel and I can't figure out what is so wrong with my 6TB except its partition style GPT which is not standard
but I cannot do anything without losing my data
attached sentinel report
Is there anything I can do to receive windows updates without jeoperdizing this 6TB disk?


- - - Updated - - -

after updating to winver 1909 the 6TB disk did not become raw but appeared as unallocated
Luckily I use Macrium, so I went back to winver 1809 and the disk looks normal again
why should 1909 see this disk in a diffrent way? it is still NTFS
thank you

You are right. I am worried about drive I, the 6TB WD disk which is a GPT partition.
The Funny thing is that my second disk which is 3TB divided into 4 partitions: D E F G was also GPT and after update to winver 1909 it was as it should, i.e. all partitions were readable but drive I was unallocated!
so it is not the GPT partition that makes the difference.
So what can I do to receive updates?
suppose I backup I on some external than it must also be GPT due to its 6TB volume and than I can format I to whatever 1909 will like but the external backup would be unallocated and I lose my data again.
and if I backup I as an image than the image could not be restored in 1909
perhaps I should jump to higher update?
thank you