External storage. More commonly called an external drive, external storage is storage that's not part of the internal parts ( external) of a computer. These drives often connect to the computer using USB (universal serial bus), eSATA, or FireWire connection. The picture is an example of a Drobo and an example of a popular external storage solution.
In the market, the hard disk comes in two different sizes. The first one is 2.5 inches hard disk, and the second one is 3.5 inches. The 2.5-inch hard disk is extensively used for laptop and external data storage. There is a sticker placed on the top cover of the hard disk, on which all the information related to the hard disk is mentioned.
Alternatively called digital storage, storage, storage media, or storage medium, a storage device is any hardware capable of holding information either temporarily or permanently. The picture shows an example of a Drobo, an external secondary mass storage device. Two types of storage devices are used with computers: a primary storage device
Read-write arm swings read-write head back and forth across platter. Central spindle allows platter to rotate at high speed. Magnetic platter stores information in binary form. Plug connections link hard drive to circuit board in personal computer. Read-write head is a tiny magnet on the end of the read-write arm..