→ Add the floppy controller manually in Storage settings before booting.
Let's build a working DOS 6.22 machine from scratch. You will need: ms dos 622 img files works with virtual box top
| Problem | Solution | |--------|----------| | VM won’t boot from floppy | Check boot order in System settings → Floppy first | | “Non-system disk” error | Format C: or run SYS C: later | | Setup says “insert disk 2” | Swap the .img via Devices → Floppy → Choose disk image | | Hard disk > 512 MB | Use smaller virtual disk; large disks cause FDISK problems | | .img file not accepted | Rename to .IMA or use VBoxManage convertfromraw | → Add the floppy controller manually in Storage