I'm trying to mount a USB stick in single-user mode (thankfully there's nothing wrong with my Mac, I'm just trying some stuff out). These are the commands I've been running:
$ mount -uw /
$ mkdir /Volumes/drive
$ mount -t msdos /dev/disk2 /Volumes/drive
mount_msdos: Unsupported sector size (0)
The USB drives connects to my system properly and is visible in /dev/. I've reformatted the drive as HFS and got the same error message. I've also tried another USB stick formatted in both FAT32 and HFS, to no avail. I assume this must mean that I'm doing something wrong here, but a quick Google search shows that most people succeed using this approach.
I'm running MacOS Sierra 10.12.6 on a mid 2012 MacBook Pro.