Solution: There never was a second drive. It must have been a partition that got wiped with the install, but there’s only the NVME in there. Sorry, guys. I dig around in my innards very frequently and just thought I was mounting a second drive this entire time. Hooray for backups.

reinstalled Mint and my second drive is absolutely invisible to everything. I can’t mount what I can’t see. I’m thinking of unplugging it and plugging it back in just because I’m out of ideas.

What could have caused a drive to become invisible after a reinstall?

Edit: Checked bios. All security disabled. Using AHCI and UEFI (tried CSM). I don’t really know what these things mean, I just know things were working properly before I reinstalled mint so I’m puzzled why it could be a BIOS issue.

Current lsblk:

<pre>NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sr0 11:0 1 1024M 0 rom
nvme0n1 259:0 0 953.9G 0 disk
├─nvme0n1p1 259:1 0 1M 0 part
├─nvme0n1p2 259:2 0 513M 0 part /boot/efi
└─nvme0n1p3 259:3 0 953.4G 0 part / </pre>