I recently downloaded the Zorin OS 16 ISO and flashed it to my USB. I want to dual boot with Windows 10, so I selected Install alongside Windows. However after that, only my second non-os HDD shows up and my OS drive doesn't.
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I have the exact same problem here. Don't want to dive into manual partition making, because I don't want to screw up my Win 10 installation by doing it wrong...
EDIT: I already deactivated fast boot in Win and activated the legacy boot option in BIOS. Just in case you haven't done that yet.
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I have disabled hibernation (fast boot is the same I think) but haven't done the legacy boot and Secure Boot should be off and I don't want to really do partitions either.
Can you both please check in your EFI settings whether you are set to AHCI or RAID?
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I didn't really find a way to check that... But my main drive is NVME, so that doesn't even support AHCI, right? When I go to "Something else" in the Zorin installer, the drive gets recognized and everything. I just don't really know how to partition it the right way... I might ask Zorin support directly since it is for the Zorin 16 Pro machine.
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Definitely would give that a shot, especially if you are loading onto an nVME drive.
nVME is more akin to an SD card than it is to an SSD card.
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There is an update here on this issue:
NOTE:
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Hey Aravisian, sorry for the late reply, but I didn't have the time for downloading and installing yet. Unfortunately, the new ISO doesn't fix the issue of the NVMe drive not being recognized in with the "alongside Windows" option.
ZorinGroup hasn't got back to me yet either. I understand that they must be super busy, but not even a "thanks for your message" or anything... I am so excited to have it on my main machine, it's hard to be patient 
I think Zorin group @zorink @AZorin should consider to implement auto-reply in their mailbox. Even if it were a machine generated reply, users at least know the message got thought to the other end.
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Honestly... nVME and eMMC both are troublesome with Linux. It used to be that the general agreement was that Linux would never work on eMMC. And for good reason. It is closer to an SD card in form and function, than it is to a standard SSD.
In the last year and a half alone, a lot of progress has been made. Many people are able to flawlessly install Linux on nVME and eMMC. But for many, it still is like pulling teeth.
In your EFI settings, are you set to AHCI or RAID?
EFI settings - Secure Boot must be disabled.
In Windows - Fast Start Up in control panel > power settings (somewhere) must be disabled.
Fastboot has been deactivated already and I don't know how to find AHCI or RAID in my EFI settings. What I read about it, is that AHCI is not compatible with NVMe drives. So I guess it is RAID then??
The funny thing is, that the NVMe drive appears in the manual installation mode in the Zorin installer. So I could technically choose it but I don't know how to partition it properly.
The other thing I was thinking was: What if I make the "Basic data partition" smaller by booting into gparted and have that space unallocated? Would that screw up my Windows partition? Would Zorin then recognize it?
Yep. And if as you indicate below, it is already running Windows, it is safe for now to assume it is set to RAID.
Yes, you can do this.
There is no logical reason that it should.
I know a way to find out. 
If you do the above, I would say it is worthwhile to set up and choose the partition you want Zorin installed to- then reformat it to FAT32. After that is complete, then run the Zorin OS Installer on that partition.
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OK, I will give it a try. Thanks for the detailed answer 
So, I will reformat it to FAT32. Shall I choose "primary" or "logical" partition? Do I leave "Mount point" off or should it be /dos or /windows? Sorry, I don't have the faintest idea of what all of that means...
Go with default for Primary or Logical.
Mount point you can set to just /
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Now I have 200GB in a new FAT32 partition and the drive still doesn't show up in "alongside Windows".
If I chose to install Zorin on that partition, would I then choose my NVMe drive for boot loader installation? Does that ensure, that I will be able to dual boot?
Yes, the same drive Windows is on.
Not on the windows partition, of course.
I'm sorry... My poor brain may be stumbling here.
Is the drive you are trying to install Zorin Onto not showing up? Or the partition?
No worries, my brain is crushed and you are helping getting the pieces back together. 
So, the drive is not showing up when choosing "install alongside Windows"
But the drive and all of the partitions are showing up nicely if I choose "Something else".
I am just not sure to where exactly to put the boot loader. I could either choose directly the drive /dev/nvme0n1 or the new fat32 partition /dev/nvme0n1p6
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Bootloader goes to the EFI partition that is FAT32.
If it is showing in Something Else, then I guess your options are to use "Something else" or to instead use "Something else."
-scratches head-
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Can you just check, in your BIOS, that you are using UEFI and that Legacy ROM/Boot is turned off.
Then when you reboot and press F12 (or whatever it is for your BIOS) to the boot selection, that you see Zorin as a boot option?
If you don't see the Zorin option then it is the same problem I encountered and fixed by doing this:
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