Hard Disk Drive What Uses More Battery Power On Laptop. A External Usb Disk Drive For Watching A Dvd - Or Extenal Hard Drive?

What uses more battery power on laptop. a external usb disk drive for watching a dvd - or extenal hard drive? - hard disk drive

Would you like to watch movies on my laptop when traveling. My laptop is not built into the floppy drive. So if you have an external hard drive with USB connection, consume less battery to watch the film with an external DVD drive?