Thank you! Very helpful.
First of all i'll wipe my SSD and re-instert HDD in the SATA i'm now using. Then i'll consider buying another SSD and start again.
Thank you again!
That seems to be the best choice.
If I can further ask you: if i wanted to buy another SSD or just go back to HDD for now, how could I format my SSD to wipe my data, if there's windows installed and my other interface is not working?
EDIT: Before buying another drive.
I could try switching my SSD with HDD and viceversa, installing Windows on the HDD and trying the ssd in the caddy.
I now remember to add: I tried running CrystaldiskInfo and it says my HDD is good, having 0 errors in the various tests.
(Sorry for the bad english, not my first language).
I bought a new Crucial MX500 SSD and I replaced my TOSHIBA MQ01ABD100 with it. I then put the HDD in the optic reader slot, in a caddy.
Premise: before this, my DVD reader didn't work.
I installed the OS (Windows 10 64b) on the SSD via USB...