These are USED ENTERPRISE SATA DRIVES. All drives have been cleaned, tested, and recertified to manufacturers specifications. Drives come with a 30 day warranty and a 1 year warranty is available for purchase at checkout. SMART reports will be provided with shipping if requested. Drive may have lettering, sticker, or colored dots used for identification. Buy with confidence!! Check out my response!! The WD Ultrastar DC HC520 12TB 7.2K SATA 6Gb/s 3.5in 4Kn HDD HUH721212ALN600 is a high-capacity internal hard drive from Western Digital. With a storage capacity of 12TB and a rotation speed of 7200 RPM, this HDD is designed for reliable and efficient data storage. Its SATA III interface provides fast data transfer speeds, making it suitable for use in various applications such as servers, data centers, and personal computers. With a cache size of 256MB and Form Factor of 3.5 inches, this Ultrastar drive is a reliable choice for large-scale storage needs.