Seagate 25pk 500gb Barracuda SATA 16mb 3.5in 6gb/S / Mfr. No.: St500dm002-25pk
Barracuda 1TB-per-disk technology incorporates 340,000 unique tracks in the width of a single inch. This incredible storage density drives new capacity possibilities and lowers your total storage costs.
Seagate AcuTrac technology enables new storage densities with accurate reading and writing to nano-sized tracks that are only 75 nanometers wide! That's about 500 times smaller than the period at the end of this sentence.