What device is used as replacement of hard disk in portable computers?

Answer 1

Sometimes, instead of a hard disk, solid-state memory, like what is in a USB drive (or thumb drive or USB stick, etc...), is used in laptops. More often, the hard drive is simply made physically less big to fit into the laptop computer's frame. A good example of miniaturized hard drives are large-capacity iPods, which store their data on a tiny hard drive within the device.