Drive failed to be found

I have cobbled together a script, which creates directories from a user input and down loads some software, which works as intended in Windows, but fails to find or recognise the drive in ReatOS.
I have had it once partially work and create the directories, so it works sporadically.

My local tree was updated with 0.4.10-dev-315-ged4eb9c (updated at 14:03:30.91 on 04/07/2018) and the ISO was compiled on my computer with RosBE.

Screenshot and the script attached.