<ul><li>Capacity: 1 Terabyte (TB) = 1024 Gigabytes (GB).</li><li>Form Factor:3.5-inch: Larger, for desktop PCs.</li><li>2.5-inch: Smaller, for laptops or portable drives.</li><li>Interface:SATA (Serial ATA): Common for internal drives (SATA 3.0 / 6Gb/s).</li><li>USB (e.g., USB 3.0): For external drives.</li><li>Performance:Spindle Speed (RPM): 5400 RPM (more power efficient) or 7200 RPM (faster).</li><li>Cache Memory: Often 64MB, helps with data access speed.</li><li>Data Transfer Rate: Around 120-220 MB/s (Megabytes per second) depending on RPM and interface.</li><li>Reliability: Measured by metrics like Shock Tolerance (Gs) and Non-Recoverable Read Error Rate (e.g., 1 in 10^14 bits).</li><li>Power Consumption: Lower for 2.5" drives and 5400 RPM models.</li><li>Desktop: WD Blue, Seagate BarraCuda, Matrix 1TB Internal HDD.</li><li>Portable: Seagate Expansion, Seagate One Touch.</li></ul>