What is the difference between a portable hard-drive and a USB flash drive?
A portable hard drive, sometimes called an external hard drive is capable of storing the entire contents of your computer’s operating system, programs and other data. USB flash drives are more rugged and less prone to data loss than hard drives. However, flash drives are significantly smaller than most hard drives and cannot hold nearly as much data. Both the portable hard drive and the flash drive are useful devices depending on your needs.