<human>:  What is the difference between a hard drive and a solid state drive?
<bot>: The main difference between a hard drive and a solid state drive is their physical structure. Hard drives use spinning platters to store and retrieve data, whereas solid state drives use interconnected microchips, with no moving parts. This makes solid state drives faster, quieter, and more durable than hard drives. Additionally, hard drives are usually cheaper than solid state drives.