The HPE 857644-B21 is a 10TB 12Gb/s SAS 3.5-inch LFF hard disk drive designed for enterprise servers and storage arrays. It spins at 7,200 RPM, uses 512e sector format, and comes in a Smart Carrier with hot-swap support for easy field replacement in HPE ProLiant Gen9 and Gen10 systems. Commonly used for backup, archiving, bulk storage, surveillance data storage, and data center expansion, it delivers scalable capacity for large data workloads. Part numbers include 857644-B21 and 857965-001, with the 872479-B21 10TB SAS 12G 7.2K LFF HDD listed as a common replacement in HPE environments.
