One of the main reasons for the computers to come in existence is to manipulate and store data along with solving complexities. Hard drive is the component that holds the data in a computer. In most common cases, Hard drive is an internal store for operating system and user information.
The ever increasing need for storage capacity, coupled with threat from the outside world when exposed through internet, has surfaced external hard drive to be a better solution over traditional internal hard drives.
An external hard drive has its own enclosure and sits outside the computer. It is normally connected to a computer via a high-speed interface cable. This interface cable allows data to flow to and fro from the external drive to the computer. Most generally used interfaces are USB, eSATA and FireWire.
The external hard drive allows user to store backup of online or offline activities. Rendering capability to hold music files, movies, disk images, and even a backup of the contents of hard drive. The external hard drive could be turned off when connected to internet. Advantage of hard drives over flash drives is that they last much more cycles when compared.
These external hard drives are portable and operates on plug-and-play basis. Thus any computer which supports USB or Firewire or any of the other interface capability will recognize the external hard drive as storage device, with just assigning a drive letter to it. Once recognized the external drive can be accessed like any other normal internal hard drive on the system they are hooked onto.
These external data storage devices makes your life simple when you really are on the move!