HP 431958-B21, 432320-001, HP 146GB 3G 10K 2.5″ SP hard drive. Alternate Part Numbers: 431954-003, DG146ABAB4. Serial Attached SCSI (SAS) is the evolution of the SCSI interface. SAS Enterprise drives satisfy the enterprise data center requirement of scalability, performance, reliability and manageability, while providing an enterprise storage infrastructure for both enterprise SAS drives and SATA disk drives. Serial Attached SCSI (SAS) provides a superior storage solution. With some storage requirements escalating and others becoming more complex, factors such as flexibility, performance, increased reliability, greater density, security, scalability and accessibility are more critical than ever. Today’s organizations consist of different kinds of environments. Enterprise data centers must be online 24 x 7, fulfill requests from numerous users simultaneously, and allow for constant growth and expansion while in operation. Other customer environments require high capacity storage and high data availability for low I/O environments. HP’s portfolio of SAS drives meets all these demands.