VVFAT is not writable from Windows NT 3.5, 3.51 and 4.0 I'm running Windows NT 3.5, 3.51 and 4.0 in QEMU 4.2.0 on Linux. I'm using a VVFAT filesystem. Command lines: $ qemu-system-i386 -L pc -cpu 486 -m 64 -vga cirrus -drive file=nt351.img,format=raw -net nic,model=pcnet -net user -soundhw sb16,pcspk -drive file=fat:rw:drived,format=raw $ qemu-system-i386 --version QEMU emulator version 4.2.0 (Debian 1:4.2-6) Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers Creating a new directory or file on drive D: (the VVFAT filesystem) fails on Windows NT 3.5, 3.51 and 4.0 (see screenshot). It succeeds on Windows NT 3.1. Is there a workaround, e.g. a QEMU flag or a change in the Windows NT driver settings?