Something

#
#       PCI IDE Config
#
#       Drive type will be set according to file extension:
#               .img: Harddisk (filesize must be multiple of 516096)
#               .iso: CD-Rom
#       Or you can override this by specifying the type via
#       pci_ide0_master_type / pci_ide0_slave_type

pci_ide0_master_installed = 1
pci_ide0_master_image = "windows.img"
pci_ide0_master_type = "hd"

pci_ide0_slave_installed = 1
pci_ide0_slave_image = "/dev/hdc"
pci_ide0_slave_type = "cdrom"