Hard drive and Optical drive on same cable?

[backseatgunner]

I'm adding an optical drive to my computer, but am out of ide cables except for the exta line attached to my hard drive. Is this safe to put them on the same cable?

 

[Cromewell]

yes its safe, but the harddrive will be limited to ata33 speed when the CD drive is active

 

[kof2000]

YOU CAN buy a pci card to add addition ide devices and still run at ata133