1,create a hard disk image using qemu-img:

qemu-img create -f raw hd.disk 1G

2,format this disk file with ext2 filesystem on it:

mkfs.ext2 hd.disk
type y

3,copy directories to hd.disk:

mount -text2 -oloop hd.disk /mnt

cp -r bin /mnt
cp -r lib /mnt
cp -r root /mnt

umount /mnt

4,run qemu with command below:

qemu -fda floppy.img -boot a -monitor stdio -drive id=disk,file=hd.disk,if=none -device ahci,id=ahci -device ide-drive,drive=disk,bus=ahci.0