![]() ![]() There will be outliers and that’s where SAS’s increased reliability makes it much more palatable. However, bear in mind that this is a mean. Now, these are also big numbers – 1.2 million hours is about 136 years and 1.6 million hours is about 182 years. SAS disks have a mean time between failure of 1.6 million hours compared to 1.2 million hours for SATA. SAS disks are also built to more exacting standards than other types of disks. Although this does make it seem that SATA disks are pretty reliable, when it comes to absolute data protection, that factor of 10 can be a big deal. Read differently, that means you may see one bit error out of every 10,000,000,000,000,000 (10 quadrillion) bits. With SAS disks, the BER is generally 1 in 10^16 bits. This metric is measured in bit error rate (BER), or how often bit errors may occur on the media. In reliability, SAS disks are an order of magnitude safer than either NL-SAS or SATA disks. Of the three kinds of disks, they are the most reliable, maintain their performance under more difficult conditions, and perform much better than either NL-SAS or SATA disks. SAS disks have replaced older SCSI disks to become the standard in enterprise-grade storage. So, what is the real difference between SAS, NL-SAS and SATA disks? Well, to be cryptic, there are a lot of differences, but I think you’ll find some surprising similarities, too. I’m focusing solely on the devices that spin really, really fast and on which most of the world’s data resides. ![]() Further, even though solid-state disks (SSD) can have a SAS or SATA interface, I’m not focused here on SSDs. Yes, there are other kinds of drives, such as Fibre Channel, but I’m focusing this article on the SAS/SATA question. ![]() When you buy a server or storage array these days, you often have the choice between three different kinds of hard drives: Serial Attached SCSI (SAS), Near Line SAS (NL-SAS) and Serial ATA (SATA). For more info, visit our Terms of Use page. This may influence how and where their products appear on our site, but vendors cannot pay to influence the content of our reviews. We may be compensated by vendors who appear on this page through methods such as affiliate links or sponsored partnerships. Scott Lowe breaks down the differences in reliability and performance between SAS, Near-Line SAS, and SATA drives. How SAS, Near Line (NL) SAS, and SATA disks compare ![]()
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