External Removable Drives3.0 TB 3.5" Seagate FreeAgent GoFlex plug and play external USB 3.0-compatible drive (left), 750 GB 3.5" Seagate Technology push-button external USB 2.0 drive (right), and a 500 GB 2.5" generic brand plug and play external USB 2.0 drive (front).
External removable HDDs typically connect via USB. Plug and play drive functionality offers system compatibility, and features large storage options and portable design. External HDDs are available in 2.5" and 3.5" sizes, and as of March 2012 their capacities generally range from 160GB to 2TB. Common sizes are 160GB, 250GB, 320GB, 500GB, 640GB, 750GB, 1TB, and 2TB.
External HDDs are available as preassembled integrated products, or may be assembled by combining an external enclosure (with USB or other interface) with a separately purchased drive.
Features such as biometric security or multiple interfaces are available at a higher cost.
External hard drives generally have a slower transfer rate than that of an internally mounted hard drive connecting through SATA.
Read more about this topic: Portable Hard Drives
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