hdiutil: Creating case-sensitive image fs for Steam

I'm attempting to use Steam on my Mac, but I set up my system to have case-sensitivity. Steam has a thread for setting up an image file with a case-sensitive file system , however, I'm finding that it doesn't work. Regardless of whether I create the sparse image from Disk Utility or from hdiutil, I get a mount-error. hdiutil: attach failed - no mountable file systems However, as far as I can tell I've created the file correctly? #!/usr/bin/env bash set -e MOUNTPT="/.000" SPARSEIMG="/Users/Shared/Steam/steam.sparseimage" if [ ! -e "${MOUNTPT}" ]; then echo "sudo mkdir -m0777 ${MOUNTPT}" sudo mkdir -m0777 "${MOUNTPT}" fi if [ ! -e "${SPARSEIMG}" ]; then hdiutil create -type SPARSE -fs 'Case-sensitive Journaled HFS+' -size 32g "${SPARSEIMG}" fi hdiutil attach -mountpoint "${MOUNTPT}" -nobrowse "${SPARSEIMG}" Can anyone tell me what I am not doing correctly? UPDATE: The image that's created mounts properly in Disk Utility, but does not with hdiutil