: It acts as the internal 8GB (standard) or larger hard drive for the emulated Xbox.
The file xbox_hdd.qcow2 is a virtual hard disk image used primarily by the emulator to simulate the storage environment of the original Microsoft Xbox. xbox-hdd.qcow2
Image grew too large on host → Run qemu-img convert -O qcow2 xbox-hdd.qcow2 xbox-hdd-compacted.qcow2 to reclaim unused space. : It acts as the internal 8GB (standard)