SAS vs SATA: Comparison, Pros & Cons

SAS and SATA are applied sciences utilized by computer systems to switch information from the motherboard to storage and the opposite approach round. On this publish, we are going to focus on how these applied sciences work, how one is completely different from the opposite, and what are the benefits and drawbacks of every expertise.

What’s SAS storage?

SAS stands for Serial-Hooked up SCSI (Small Pc System interface). It’s a technique of transferring information between laptop peripheral gadgets one bit at a time by means of a skinny cable. Within the case of enterprise enterprises, SAS is essential in terms of accessing mass storage gadgets.

How does SAS perform?    

SAS is a protocol for point-to-point information switch between computer systems and storage gadgets. It signifies that information is transferred straight from the cupboard space to the pc it’s storing the information for and the opposite approach round, straight by means of a bodily cable that connects them. The time period serial denotes that the information is transferred one bit at a time, sequentially.

The SAS system combines 4 elements

  • Targets: The storage gadgets which are related to a SAS system. 
  • Initiators: The mechanism for receiving and responding to requests from the targets.
  • Service Supply Subsystem: The system that connects the SAS initiators with the targets.
  • Expanders: Elective port-multiplier {hardware} that allows you to lengthen the variety of storage gadgets you’ll be able to connect with a SAS system. 

The SAS system is often carried out by companies which have substantial storage, backup, and archiving wants.

What are some great benefits of the SAS storage system?

As a serial information switch protocol, SAS has some apparent benefits over parallel information transmission protocols.

A parallel information switch interface wants two separate cables for incoming and outgoing information. Meaning you would want one cable to switch information from the motherboard to the storage and one other for information going from the storage to the motherboard. So, how is SAS higher than a parallel system?

  1. SAS cables are smaller and skinny giving laptop producers more room to work with and because it’s only one cable, they are often extra versatile.
  2. The cables for SAS are protected in opposition to magnetic subject interference with built-in dividers.
  3. The storage system can queue incoming information. 
  4. SAS can help 65,535 gadgets related to an interface with an expander whereas a parallel SCSI can have solely 16 – one host and 15 different connections.
  5. Parallel SCSI can typically be sooner but it surely loses information if the cable size is far. You received’t encounter this drawback with SAS.
  6. SAS is designed for twenty-four/7 enterprise use – it’s constructed for reliability. 

What are the disadvantages of SAS?

  • SAS is pricey. It does minimize the fee a bit when in comparison with parallel methods however if you happen to evaluate it to SATA (which we are going to speak about proper after this), it’s costly.
  • It consumes extra energy to function.
  • SAS is designed for velocity therefore, focuses much less on storage. Most SAS drives are 500GB and something greater than that could be very costly.

Additionally Learn – Stata vs. R – What’s Higher for Information Science Professionals?

What’s SATA storage?

SATA stands for Serial Superior Expertise Attachment. Because the title suggests, this technique makes use of a serial mode of information transmission similar to SAS. It’s the usual information switch interface utilized in private computer systems. SATA was an excellent enchancment over the parallel attachment methods. It provides a throughput of 6GB/second.

In contrast to SAS, SATA is targeted on cupboard space and it’s reasonably straightforward to seek out SATA drives starting from 1TB to 16TB.

Benefits of SATA 

  • SATA gadgets are cheaper than SAS
  • SATA is optimized for area, it gives extra storage for much less cash.
  • They’ve decrease consumption of energy
  • The SATA cables could be quick – as much as 1 meter. 

Disadvantages of SATA 

  • It has a decrease reliability quotient than SAS as it’s principally used for private computer systems.
  • It doesn’t help lengthy cable runs
  • It helps solely 32 point-to-point connections whereas SAS helps 256.
  • SATA has a decrease throughput fee than SAS


Throughput As much as 12Gbps 6Gbps
Storage Much less in comparison with SATA Extra in comparison with SAS
Value It’s dearer than SATA Cheaper
Latency Under 100 microseconds to over 100 milliseconds Under 1 millisecond to over 100 milliseconds
Queues 1 1
Command per queue 256 32
Functions Servers and Enterprise Functions Private Computer systems


Each SAS and SATA are nice enhancements from the parallel information transmission methods as they’ve minimize the fee and bodily area required whereas barely compromising on switch velocity. Nonetheless, evaluating SAS and SATA is just a little unfair as each are designed and meant for various functions and each have options that cater to their supposed person bases. As an example, SATA is usually to be used in PCs therefore it doesn’t want as a lot reliability as SAS, so it may minimize some prices in that facet. Equally, SAS has to eat extra energy with a view to help the lengthy cable runs – it’s a necessity for enterprise utilization.

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