Which of the following technologies has the FASTEST hard drive interface?

SATA III (Serial ATA 3) offers a maximum transfer rate of 6 Gbit/s for a single lane, which is typically less than the potential aggregate speed of SAS-2 using wide ports.

While Fibre Channel (FC) fabrics can achieve high speeds, FC-AL (Fibre Channel Arbitrated Loop) drives, which were the direct attached FC drive type, generally offered lower speeds (e.g., 1 or 2 Gbit/s) than modern SAS-2 interfaces.

SAS-2 (Serial Attached SCSI 2) provides a data transfer rate of 6 Gbit/s per lane, and its architecture allows for multiple lanes (wide ports) to be aggregated, achieving significantly higher effective throughput (e.g., 24 Gbit/s for a 4-lane wide port) compared to single-lane SATA III (6 Gbit/s) or older SCSI-3 parallel interfaces.

SCSI-3 is a broad standard; its fastest parallel SCSI implementations like Ultra-320 SCSI were limited to 320 MB/s (2.56 Gbit/s), which is considerably slower than SAS-2.