Did you read where OP said they are throwing an install party?

RTFM, always good advice. Thanks

Thanks, saving these! It is NTFS, found it had been flagged as dirty and was in fact recommending chkdsk. Chkdsk didn’t find anything to fix, but its mountable again back in linux. I figured NTFS would be fine since I’m dual booting (separate drives) while I get used to Linux. Should I power off the Pi before removing next time?