![]() ![]() This is another type of interface that, again, is usable either with HDDs or SSDs. While fine for everyday computing, in a RAID server array or datacentre environment, often a better alternative has been to use ‘SAS’ drives, which stands for Serial Attached SCSI. Serial Advanced Technology Attachment (more commonly referred to as SATA) is a type of hardware interface that allows the transfer of data to and from HDDs and SSDs. Let’s start with a few basics about SATA and SAS. Some datacentre environments, Video editing, financial modelling, and simulation. ![]() Personal & desktop use, tablets & datacentres, a cheap upgrade from HDD Limited capacities, expensive, ATA commandsĭatacentres, mission-critical enterprise applications Low capacities, old technology, very expensive Super fast speeds -8x faster than SATA, latency reduction Half duplex data transfer, inexpensive, large capacities, low power consumption, single ported, SCSI commands The table below gives a basic overview of the key differences.įast data transfer speeds, full duplex data transfer, 8m cable length, dual-ported, support multiple initiators Side by side what are the pros and cons of SAS v SATA v PCIe? It was developed by a consortium of manufacturers specifically for SSDs to overcome the speed bottleneck imposed by the older SATA connection. It offers an optimised command and completion path for use with NVMe-based storage. NVMe is the latest high-performance and optimised protocol which supersedes AHCI and compliments PCIe technology. However, depending on usage, real-world benchmarks may not reflect this massive gain due to bottlenecks elsewhere in the PC. Entry-level PCIe SSD speeds are two to three times faster than the older generation of SATA 3.0 SSDs mainly due to the number of channels contained by each to transfer data (roughly 10 for SATA and 25 for PCIe). PCI Express supersedes SATA as the latest high bandwidth interface. For most consumers, this is more than fast enough. SATA transfer rates begin at 150 MB/s and max out at 600 MB/s for third-generation technology. It employs the command protocol AHCI (it also supports IDE) which was built with slower spinning disks in mind rather than flash memory. SATA is the market incumbent and dominant interface for connecting an SSD to the PC. Serial Attached SCSI or SAS is a legacy interface that is typically used for transferring data to external storage commonly found in large datacentres. However, we must not forget the SAS interface and although old, still has a valuable role to play. Another interface, SAS, is aimed at the datacentre market and HDD storage in particular but there is a new kid on the block, PCIe which looks to shake things up.Īlthough we say ‘new’, PCIe has been around since 2004 but it hasn’t been until recently that it has come to the fore, mainly due to 3D NAND flash making PCIe-based storage more appealing and cheaper. SATA has been around for years with the latest incarnation SATA 3, launched in 2009. The most common type of interface is SATA which can be found on most SSDs and embedded technology. There’s a little bit of wiggle room here, but in general, you must match the storage interface to the interface used in the backplane of your server or storage controller.Ĭhoosing your interface ultimately comes down to what you are using your storage for. The particular computer or storage device you have will also dictate which interface you can use. With so many varieties of storage technology available, it can be quite bewildering in choosing the right one. ![]()
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