While both SATA and SAS drives can be used in personal computing, most small business offices and personal setups will not make regular use of SAS' data transfer capabilities. For example, the 2TB version of the same hard drive costs $146 for SAS and $114 for SATA. ![]() Prices usually increase according to the amount of storage space available. The SATA equivalent is about 10% cheaper at $87. A SAS drive uses at least two times as much signaling voltage as a SATA drive does.Īs of January 2016, a 1TB 7200 rpm SAS drive goes for about $100 on Amazon. SAS uses more power than SATA does, which allows it to support server backplanes and have longer cables. ![]() Hitachi and Western Digital were the most reliable over time, while nearly 30% of Seagate drives failed after three years of use. In 2013, the backup service Backblaze analyzed the reliability of three popular hard drive brands: Hitachi, Western Digital, and Seagate. Brand may also matter when hunting for the most reliable drive, be it SAS or SATA. It is possible to have a hard drive last for several years, regardless of the tasks performed on it all performance and reliability statistics exist on a bell curve, with some drives performing better or worse than others. The mean time between failures (MTBF) for a SAS drive is 1.2 to 1.6 million hours of use at 45 ☌, while the MTBF for a SATA drive is 700,000 hours to 1.2 million hours of use at 25 ☌. This is a costly problem for businesses that depend on reliable hard drives. While a SATA drive could technically be used in all the same ways that a SAS drive could be (e.g., for a server), it would perform more slowly and would be more likely to fail (or suggest failure-give a false positive-even when it has not technically failed). A 15000 rpm SAS drive will most likely read and write a 500GB file faster than a 7200 rpm SATA drive will.Ī significant difference between SAS and SATA is that SAS is engineered to withstand 24/7 use in enterprises, such as datacenters. This difference in speed is most noticeable when handling large files. Most consumer-level SATA-based drives operate at 5400 rpm and up to 7200 rpm, while most SAS-based drives operate between 7200 rpm and 15000 rpm. Several factors affect drive speed on the whole, but generally the higher the rpm, the faster the drive's throughput and similar performance functions will be. The number of revolutions per minute (rpm) that a drive can perform affects throughput. However, there is some overlap between slower SAS drives and faster SATA drives. ( IOPS may also be measured throughput and IOPS results often suggest the same things about a drive.) The throughput of SAS drives is usually higher than that of SATA drives there are simply fewer delays in general. To measure drive speeds, drive throughput is benchmarked, or tested. Throughput is the amount of data that can be moved, processed, or read and written in a certain amount of time. ![]() The SATA equivalent is about 10% cheaper at $87ġTB 7200 rpm SAS drive goes for about $100 Power and data fused into one connection.ħ00,000 hours - 1.2M hours at 25 ☌, may fail after long period of use Power and data split into two connections.Ĭan be up to 10m (33ft) long. ![]() Narrow, can be up to a meter (roughly 3ft) long. If a Dual Port SAS connection is used then transfer speeds will be 2 x 6Gb/s. Lower MTBF than SAS (700,000 hours to 1.2 million hours of use at 25 ☌), less suited for servers.Įxpensive, less storage capacity, uses more power to operateĭata transfers at the rate of up to 6 Gb/sĭata transfers at the rate of up to 6 Gb/s, but generally faster than SATA. Serial Attached SCSI (pronounced "scuzzy") or Serial Attached Small Computer System Interface.įast data transfer rate, higher MTBF than SATA (1.2 to 1.6 million hours of use at 45 ☌), longer cables, sometimes higher rpm. Serial ATA or Serial Advanced Technology Attachment. Comparison chart SATA versus Serial Attached SCSI comparison chart
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