This article mainly introduces the difference between SAS and SATA in hard disk drive (HDD). SAS's interface technology is backward compatible with SATA. Specifically, they are mainly compatible at the physical layer and protocol layer.   At the physical layer, the SAS interface and the SATA interface are fully compatible, and SATA hard drives can be used directly in a SAS environment. In terms of interface, the SAS controller can directly control SATA hard drives, but SAS cannot be used directly in a SATA environment because the SATA controller cannot control SAS hard drives.   SAS consists of three types of protocols at the protocol layer, and depending on the connected device, the corresponding protocol is used for data transmission. Serial SCSI protocol is used to send SCSI commands. SCSI management protocols are used to maintain and manage attached devices. The SATA channel protocol is used to transmit data between SAS and SATA.   In terms of price, SAS hard drives (such as ST8000NM001A SAS 8TB) are generally more expensive than SATA (such as HUS728T8TALE6L4 8TB SATA) hard drives. The rotation speed of SATA hard disk is between 5400 and 7200. SAS hard drives are basically 10,000 rpm or 15,000 rpm and are equipped with rotational vibration compensation to ensure data accuracy, so they have higher reliability. SAS hard drives are used in applications where data volume is large and data availability is extremely critical.   SATA is a great technology to have in your computer if you're storing information that you don't need to use on a regular basis. Contact us, to provide you with the best choice and solution, the factory price and three years warranty, is your most secure choice.