HGST Deskstar NAS HDN726040ALE614 is a 4TB 3.5-inch internal hard drive designed for desktop NAS systems. Operating at 7200 RPM, it offers enhanced performance with media transfer rates up to 20% faster than 5400 RPM drives and seek times of less than 12 milliseconds. The drive features a 6Gb/s SATA interface and a 128MB cache buffer, facilitating efficient data processing. Engineered for reliability, it boasts a mean time between failures (MTBF) of 1 million hours and includes a rotational vibration sensor, making it suitable for multi-drive RAID arrays.