This would be in the Kernel, boot, graphics & hardware category, but I’m only 75% sure the problem is of that nature, and I’m not exactly confident in my tech skills, so Newbie category it is. From what I remember of this particular forum software it shouldn’t be too hard to move me if that’s needed…?
Right so uh, a crash of unknown cause happened (but as the thread title says that isn’t what I’m seeking help with) and when I booted I couldn’t mount any of my other at the time connected drives besides the default one Endeavour is installed on. I have a whole separate Windows Drive in my computer that I select with a boot manager when I need Windows for something, neither of its partitions will mount, despite it still booting into Windows mostly fine. I have three external hard drives (though I usually only have one plugged in at a time, which will prove relevant in a second) and the one I had plugged in at the crash isn’t mounting either. The other two are still operating fine.
When mounting the now-problematic drives I get the error message (where [NUMERAL] is a consistent number for each error message and [DRIVE NAME] is the name of the drive)
The requested operation has failed: Error mounting /dev/sdc[NUMERAL] at /run/media/sysid-ace/[DRIVE NAME]: wrong fs type, bad option, bad superblock on /dev/sdc[NUMERAL], missing codepage or helper program, or other error
I read various threads by people suffering somewhat similar issues, but none of what people suggested in those threads that I tried worked, so here I am.
Among the things I’ve tried are
- reinstalling ntfs-3g using yay
 - reinstalling ntfs-3g again using a more targeted pacman command, in case I got something wrong earlier (
sudo pacman -S ntfs-3gwas what it was) - running 
sudo ntfsfix /dev/sda1(this just uh, couldn’t run) - reading half a thread where people speculate hardware issues are occurring, which I don’t think can be the case here
 
And maybe one or two other things.
One thing the drives are definitely not, I’d like to underscore again, are dead. I can boot into the Windows ones just fine, and even then read the problematic external drive when in Windows.
Anyway time for that stuff I’m meant to attach, huh? I hope I understood that post properly and am including all I need to…
NAME   TYPE   SIZE PTTYPE FSTYPE
sda    disk 931.5G gpt
├─sda1 part     1G gpt    vfat
└─sda2 part 930.5G gpt    ext4
sdb    disk   3.6T gpt
├─sdb1 part   100M gpt    vfat
├─sdb2 part    16M gpt
├─sdb3 part   1.4T gpt    ntfs
├─sdb4 part   518M gpt    ntfs
├─sdb5 part   500M gpt    ntfs
└─sdb6 part   1.9T gpt    ntfs
sdc    disk   3.6T gpt
├─sdc1 part    16M gpt
└─sdc2 part   3.6T gpt    ntfs