Seagate 2TB hard drives vary widely depending on the model. Portable external drives (like Expansion or One Touch) feature 2.5-inch form factors, USB 3.0 interfaces, and speeds around 5400 RPM. Internal desktop drives (such as the BarraCuda) utilize 3.5-inch form factors, SATA 6Gb/s connections, 7200 RPM, and up to 220 MB/s read speeds. [1, 2, 3] Seagate offers multiple distinct 2TB lines. The specifications differ significantly between portable external drives, desktop external drives, and internal drives: [1] 1. External Portable Drives (Seagate Expansion, One Touch, Backup Plus) Form Factor: 2.5-inch Interface: USB 3.0 (up to 5 Gbps, backward compatible with USB 2.0) Rotational Speed: Usually 5400 RPM Average Dimensions: ~ 11.5 × 8.0 × 1.2 cm Weight: ~ 150g - 160g Special Features: The One Touch series includes hardware encryption ...