External hard drives are connected to computers through the use of an external port secured to the motherboard. External hard drives are different in size and shape, however their main purpose is to store documents, video, images, audio and many other file types. The actual capacities of the drives differ from large to small. This assortment of sizes allows the consumer to choose the right external hard drive for their needs.
Historically, computer drives were large and unwieldy. Because of this, they were placed in their own casing that resided outside the computer. These hard drives fit into the category of external hard drives. As technology advanced, disk size became smaller and manufacturers could mount drives inside the computer's shell. Those who purchased computers, though, began to require more and more storage space as file sizes grew and the market for external hard drives was born.
External hard drives come in a variety of styles and design. In most cases the internal structure of the hard drive itself is very similar to the standard internal hard drive on most computers.
External hard drives come in two categories: High capacity hard drives that have a maximum of two terabytes and the smaller portable external hard drives which have a size capacity that varies from 64 MB to 320 GB. This second class of external hard drives includes the flash or solid-state drives that are connected via USB ports.
Connectivity for external hard drives has varied widely over time. The standard connection ports are SATA (Serial Advanced Technology Attachment), IDE (Integrated Drive Electronics), SCSI (Small Computer System Interface), USB 1.1 and 2.0 (Universal Serial Bus), IEEE 1394 (Firewire) and eSATA (External Serial Advanced Technology Attachment). The most commonly used connection types that come standard on computers today are USB and Firewire.
High capacity external drives and portable external hard drives have two main variances. The first is storage capacity. High capacity drives hold up to two terabytes of information. Reasons for this are that they are powered by an external source and they are not limited by physical size. Multiple layers of disks and head mechanisms can be placed within the unit. Portable external hard drives are limited by their size and the fact that the computer they are connected to generally powers them. Storage size for solid-state or flash drives is simply limited by current technology because these external hard drives are actually just printed circuit boards.
Consumers looking for differences in external hard drives will find them in colors and sometimes shape. Colors of drive casings can be as varied as a manufacturer would like and shape is only limited to what can be produced by the various injection molds.
Craig Stephenson is an expert in computer technology. Working in the computer field for over thirty years he has seen huge technological development and understands just how good hard drives are today. If you are searching for affordable external hard drives please visit http://www.ebuyer.com
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