There are many kinds of storage media in the world, but what makes SAS hard drive that much different from other forms of storage? We all know that information is getting bigger and better, so storage space is also becoming larger. Just recently, a new record was set by Seagate Technology with their 60TB solid-state disk (SSD) – which will continue to grow.

SAS hard drives come in 2 main types: 10K and 15K. The K refers to the rotational speed of the hard drive, i.e. 10,000 and 15,000 revolutions per minute respectively.


While there's no doubt that the technology is becoming more advanced, it's not just about technologies or storage space – what also matters is how we can effectively use such resources. The following are the things you should know about SAS hard drive:


SAS stands for Serial Attached SCSI (Small Computer System Interface). It's a point-to-point serial protocol that allows for communication between a host bus adapter and a hard drive.


It uses a low-voltage differential signaling method, which is meticulously created to deliver data at high speeds while keeping power consumption in check. It also bypasses the issues of crosstalk between neighboring wires.


SAS hard drives are built to last longer and perform more efficiently.

It's a reliable technology that could potentially make your data center more efficient and cost-effective by delivering faster speeds while using less power compared to other storage media.

SAS Reliability

Low-cost, high-capacity SAS hard drives are designed for applications that require speed and high availability. They are more reliable than your typical SATA hard drives, delivering advanced features for enhanced performance, capacity, reliability, and power efficiency.

SAS Hard Drive Speed

The rotational speed of the SAS hard drive is one of the main factors that contribute to its superior performance compared with other forms of storage media. There are two types of SAS hard drives: 10K and 15K. The first letter refers to the rotational speed of 10,000 rpm while the second letter refers to rotational speed measured in revolutions per minute (rpm). Higher speed allows you to store more information during a given period, which also helps save energy usage.

Advantages Of SAS Over SATA

The SAS interface is more efficient than the SATA interface in terms of data transmission, power consumption, and heat generation.

SAS hard drive also features a faster speed measurement - around 12GBps (gigabytes per second) while its counterpart only clocks at 6GBps. This means that SAS hard drives can store and deliver data faster compared with SATA drives which make for a smoother computing experience.

SAS Hard Drive Versus SATA Hard Drive

Apart from having higher speeds and technologies, SAS hard drives are also known to be more reliable compared with SATA or traditional HDDs. Some of the benefits it offers include Efficiency: SAS provides advanced point-to-point connectivity between host bus adapters (HBAs) and disk drives at lower latencies – less power is used by the hard drive.

Shock Resistance: SAS hard drives are also shock-resistant which also contributes to their reliability compared with other storage media. It can withstand more than 1000Gs of vibration during operation which means it will retain stored data even when faced with rough road conditions. Higher Storage Capacity: SAS hard drives have a higher capacity compared with typical SATA HDDs, allowing for faster and better performance from your server.
SAS explained

Serial Attached SCSI is an acronym for “serial connected SCSI.” Small Computer Systems Interface, or SCSI, is a jargon term for “parallel technology.” SAS has replaced it since it was the former parallel technology.
SAS has a similar build to that of SATA:


  • 2 conductors for sending data
  • 2 conductors for receiving data
  • Ground cables in between the conductors to reduce interference

Differential signals for data transmission
NOTE: It is not the same as SATA. SAS breaks up data into smaller packets and sends them one after another to improve reliability and error detection.

SAS hard drives also provide faster speeds compared with SATA:

SATA maxes out at about 150MB/s (megabytes per second), while SAS goes far beyond that, reaching 450-600MB/s or even higher. This means it can read and write more information per unit of time which allows you to perform your daily tasks seamlessly, whether for personal use or business purposes. The technology behind SAS enables increased performance speed while using less power compared with other storage media types.


SAS is a more advanced technology aimed at business users. It was designed with speed and reliability in mind so if your workload requires it, then you should use SAS hard drives. Since they have better performance compared to SATA HDDs, they are also more expensive – around 30% up to almost 2 times the price of SATA HDDs.