An external hard drive is a portable storage device that can be attached to a computer through a USB or FireWire connection, or wirelessly. External hard drives typically have high storage capacities and are often used to back up computers or serve as a network drive.
What is a hard disk and what does it do? Hard disks (hard drives) are used to store large amounts of data in PCs, laptops and other digital systems. The main hard disk in a PC system is where the operating system, executable programs and files are stored.
Advantages Large capacity Faster than optical disks like DVD’S Persistent storage Easily replaced and upgraded
Disadvantages Relies on moving parts Disk surface can be damaged Heavy power consumption Noisy Slower read and write speed than RAM
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