Not sure how live 6 handles it, but try this:
Leave the floppy out at boot. Wait for a complete boot, then insert a 1.72. If the drive shows activity, wait a bit then do just "mount" and see if the drive is listed. If that doesn't work, try unplugging the drive, insert the floppy, then plug the drive back in.
If the drive is listed in "mount", but doesn't work right, "umount /dev/sdc" then try what's below.
If it still doesn't work, use a 1.72:
root:# ls /mnt/floppy || mkdir /mnt/floppy # I think /mnt/floppy is already there, but create it if it isn't
root:# mount /dev/sdc /mnt/floppy #mount should be able to detect the filesystem type
If the filesystem type isn't detected, mount the 1.72 read only as a test:
root:# mount -r -t ext2 /dev/sdc /mnt/floppy
If this works well, try it without "-r" to mount it read/write.
I don't remember seeing a 1.72MB msdos formatted floppy. I think it's ext2. If I'm wrong about that, I'm out of ideas.Later Edit:
I see there are several ways of doing an "msdos" 1.72. Some created by ms software, some by linux tools. Seems the best way to handle these is mtools. "which mdir" is a way to check to see if mtools is installed; don't know if it is on 6 live. "info mtools", or if you don't like info (I don't), here's mtool's info entry online: https://www.gnu.org/software/mtools/manual/mtools.html
. Mtools won't be configured for /dev/sdc by default, so look at the "Configuration" section of the info entry.
You can probably get the filenames straightened out, but most floppy formats larger than 1.44M run only half as fast as 1.44. It will be slow.
I do wonder how VL7.0-STD-GOLD-LIVE would handle it.