Thuglas :
Hi. I want to reset my HDD and SSD so that nothing is on them. I have two HDD's, but currently only use one of them (this one is very full), I also have 1 SSD where my windows is. What I want to do is resetting and removing all data from both my SSD and HDD + installing my other HDD (that hasnt been used yet) I have no important files, but so my question is; How do I remove everything, and what will happen with my windows 10? I do have windows 10 on my USB (but no license key). And can I also just install my other HDD and that will work, or do I have to do something about it first or after?
Thanks in advance
No responsibility taken but this is what I did.
Load all the discs, boot from retail version of Win 10, choose 64 bit if that's your config. Choose the ssd you want windows on.
Then choose Custom install. It asks where to put Win 10 and shows 4 partitions, system, recovery, unallocated and primary.
If you load it in Primary you will have 2 copies of windows, what you have now on the old ssd, plus the new one. Imalso dont know how you would format that drive then.
What I Was told to do , was to delete all the partitions, except Unallocated ( actually that is greyed out anyway - if I remember well )
Then select Unallocated. With my NVMe PCie discs its says its not possible, ignore that, but in my Samsung 850 Evo that was possible.
Now windows knows to format the whole drive and rebiuld the GPT Partitions, and then you load windows into the Primary drive.
Note what phased me was after deleteing all the partitions the drive looked very small, i thought by deleteing partitions it would throw the extra space at the unallocated, it did not on my system. But when Windows recreates the gpt partitions after formatting it - then you see 500GB again

.
Note when loading Windows despite heing loaded before and inputting my retail keys, it still asked for the prod key no.
I had been told it would know it as its locked to the MB.
Apparently, you just skip that part and somehow magically later Windows knows it was loaded before or an approved free upgrade. A friend has done this and Inchecked as I have a Laptop that upgraded from Win 7 legitimately.
Note once I didnt delete all the deletable partitions and ended up with 2 partitions, 2 copies of windows and instability. I redid it and it was fine.
Check MS to be sure I got this right. Plus I have no idea about folks without a licence key other than what my friend showed me. His system has a clean install and worked first time - so I assume he is corrdct.