Simplex [~] % mount
C:/msys64 on / type ntfs (binary,noacl,auto)
C:/msys64/usr/bin on /bin type ntfs (binary,noacl,auto)
C: on /c type ntfs (binary,noacl,posix=0,user,noumount,auto)
E: on /e type udf (binary,noacl,posix=0,user,noumount,auto)
G: on /g type ntfs (binary,noacl,posix=0,user,noumount,auto)
H: on /h type ntfs (binary,noacl,posix=0,user,noumount,auto)
I: on /i type ntfs (binary,noacl,posix=0,user,noumount,auto)
Z: on /z type smbfs (binary,noacl,posix=0,user,noumount,auto)
Simplex [~] % ls /
InstallationLog.txt  etc/                  mingw32_shell.bat*  network.xml
autorebase.bat       maintenancetool.dat   mingw64/            proc/
bin/                 maintenancetool.exe*  mingw64_shell.bat*  tmp/
components.xml       maintenancetool.ini   msys2.ico           usr/
dev/                 mingw32/              msys2_shell.bat*    var/
Simplex [~] % ls /c/
$Recycle.Bin/            Recovery/                   hiberfil.sys
Documents and Settings@  System Volume Information/  msys64/
MSOCache/                USB002                      msys64.tgz
NVIDIA/                  Users/                      openimageio-em64t/
PerfLogs/                Windows/                    openimageio-ia32/
Program Files/           bin/                        pagefile.sys
Program Files (x86)/     bin2/                       texlive/
ProgramData/             emacs/                      tmp/
Python27/                genarts/
Simplex [~] % mount c:\\ /
mount: warning: couldn't determine mount type.
mount: /: Operation not permitted
Simplex [~] % mount c:/ /
mount: warning: couldn't determine mount type.
mount: /: Operation not permitted
Simplex [~] %