16 MB to 32 MB is more than enough; even the default 32 MB is generous for DOS.
Click the icon (a plus sign on a floppy disk). ms dos 622 img files works with virtual box top
WinImage (trial) or dd on Linux/Mac.
You cannot just download any random .img file. Corrupted or incorrectly formatted images will never boot. Here are the trusted sources and validation methods: 16 MB to 32 MB is more than
Before using your .IMG files, you must prepare a specific virtual machine (VM) container within the Oracle VM VirtualBox application. Name it something clear like "MS-DOS 6.22". ms dos 622 img files works with virtual box top