@jjairpants Welcome to the Rockstor community forum.
It would help to have a little more detail here on your v4 experience, i.e. how does your experience differ from that show in the installer guide here:
https://rockstor.com/docs/installation/installer-howto.html
If we take it literally that your intended boot drive is just not show, it may be that it is too big:
I.e. under “Select Installation Disk”:
https://rockstor.com/docs/installation/installer-howto.html#select-installation-disk
We have:
Use cursor keys to highlight, then the “Enter” key to select. Only devices less than 5000 GB (5 TB) are shown. Larger disks are assumed to be data disks.
Does that tally with info your have there but haven’t detailed here. Always best to pop in some details to help those here help you. If that is the case, then you will need to take grub up on it’s “edit” offer and remove that safe-guard. It used to be much smaller but it ended up catching far too many folks. We favour having a dedicated smaller system drive to encourage OS and data seperation, plus we still don’t offer proper redundancy on the system drive as per the following recent forum thread discussion:
The bit you would need to remove on the kernel command line would be the following from our installer config GitHub repository:
“rd.kiwi.oem.maxdisk=5000G” from the appropriate profile section. Should work via a live grub boot edit option on any existing install however.
Let us know if this was it. We need to add documentation on this front I think. Safetey measure or otherwise it’s frustrating to come across it without knowing why. We could link to a short how-to from the section I referenced above. But that’s a might large system disk already (> 5 TB) just to hold a few Gs for system OS files.
Hope that helps.