# socat  - UNIX-CONNECT:/VM_DISK_IMG/HDs/XXX.XXX.XXX2/XXX.monitor

# (qemu) info block

ide0-hd0: type=hd removable=0 file=/dev/null ro=0 drv=host_device encrypted=0
ide1-cd0: type=cdrom removable=1 locked=0 file=/TMP/CentOS-5.9-x86_64-bin-DVD-1of2.iso
floppy0: type=floppy removable=1 locked=0 [not inserted]
sd0: type=floppy removable=1 locked=0 [not inserted]

# (qemu) change ide1-cd0 /TMP/CentOS-5.9-x86_64-bin-DVD-2of2.iso

# (qemu) info block
ide0-hd0: type=hd removable=0 file=/dev/null ro=0 drv=host_device encrypted=0
ide1-cd0: type=cdrom removable=1 locked=0 file=/TMP/CentOS-5.9-x86_64-bin-DVD-2of2.iso ro=0  drv=raw encrypted=0
floppy0: type=floppy removable=1 locked=0 [not inserted]
sd0: type=floppy removable=1 locked=0 [not inserted]

제거 
(qemu) eject ide1-cd0
(qemu) info block
ide0-hd0: type=hd removable=0 file=/dev/null ro=0 drv=host_device encrypted=0
ide1-cd0: type=cdrom removable=1 locked=0 [not inserted]
floppy0: type=floppy removable=1 locked=0 [not inserted]
sd0: type=floppy removable=1 locked=0 [not inserted]