The WUH721818AL5205 is a high-capacity, enterprise-grade hard disk drive from WD/HGST's Ultrastar DC HC550 series, offering 18TB of storage. This HDD features a 3.5-inch form factor and utilizes a SAS interface with a transfer rate of 12Gb/s. A standout aspect of this model is its SED-FIPS (Self-Encrypting Drive - Federal Information Processing Standards) certification, which ensures the highest level of data security and encryption, tailored for government and regulatory agency use where data protection is paramount. Like other drives in the Ultrastar DC HC550 series, it employs 512e technology for compatibility with older 512-byte sector technologies while benefiting from modern storage densities. The drive is engineered for reliability in 24/7 operational environments, making it ideal for critical applications such as data analysis, cloud storage, and deep archiving solutions. Its FIPS-certified encryption makes it highly suited for sectors with rigorous compliance requirements, such as finance, healthcare, and defense, offering them a secure data storage solution without compromising on capacity or performance.