A SAS drive, also known as a Serial Attached SCSI drive, is a type of disk drive that uses a Small Computer Systems Interface (SCSI) for data transfer. Hard drives with SAS interface are similar to SATA (Serial Advanced Technology Attachment) drives, but they offer faster transfer speeds, larger storage capacities, and improved reliability compared to SATA drives.

SAS drives are commonly used in data-intensive applications like servers, data centers, and other enterprise-level systems. They are also available in larger storage capacities, ranging from 1TB to 16TB or more, which makes them an ideal choice for businesses or individuals who require a large amount of data storage.