SAS vs. SATA.
SAS stands for Serial Attached SCSI (pronounced "scuzzy") or Serial Attached Small Computer System Interface, while SATA stands for Serial ATA or Serial Advanced Technology Attachment.
What is a SATA connector?
SATA (Serial AT Attachment) is a computer interface/connector that connects host bus adapters to storage devices like hard drives (HDD), optical drives, and solid-state drives (SSD).
SATA stands for “serial advanced technology attachment.” Advanced technology attachment (ATA) was the previous form of the technology that was used in the parallel communication days. SATA replaces it.
SATA is implemented in 2 areas:
- A SATA cable
- SATA connectors, to which the cable hooks up
The SATA interface is built with:
- 2 conductors for sending data
- 2 conductors for retrieving data
- Ground cables in between the conductors to prevent interference
It also has a power cable that powers the internal storage drive .
What is a SAS connector?
SAS (Serial Attached SCSI) is a serial protocol moving data to and from storage devices like hard disk drives (HDD) and tape drives.
SAS stands for “serial attached SCSI.” SCSI (commonly pronounced “scuzzy”) stands for “small computer systems interface.” SCSI was the former parallel technology that SAS has replaced.
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
How many pins does a SATA connector have?
A SATA data cable has 7 pins and a SATA power cable has 15 pins.
How many pins does a SAS connector have?
SAS connectors are usually 7-pin connection points.
Difference between SATA and SAS
Quora Difference Between SATA And SAS Points
Why SATA is better for storage
Why SAS is better for servers and workstations
SSD performance for SAS and SATA
Difference between SATA and SAS
But here’s where SAS differs. In a SATA cable, all 4 wires are placed within the same cable. In a SAS cable, the 4 wires are separated into 2 different cables. This isn’t parallel technology; each cable still houses both an incoming and outgoing wire.
Why divide the wires between 2 cables? So you can connect more devices to one another. With a SATA cable, you can only link the motherboard and the storage drive. You could hook up an expansion device, but that takes up valuable room inside your computer.
With a SAS cable, you can hook up the motherboard to both a storage drive and another piece of hardware that has SAS connectors.
Comparison chart
SATA versus Serial Attached SCSI comparison chart |
||
SATA |
Serial Attached SCSI |
|
Acronym for |
Serial ATA or Serial Advanced Technology Attachment. |
Serial Attached SCSI (pronounced "scuzzy") or Serial Attached Small Computer System Interface. |
Advantages |
Inexpensive, large storage capacity. |
Fast data transfer rate, higher MTBF than SATA (1.2 to 1.6 million hours of use at 45 °C), longer cables, sometimes higher rpm. |
Disadvantages |
Lower MTBF than SAS (700,000 hours to 1.2 million hours of use at 25 °C), less suited for servers. |
Expensive, less storage capacity, uses more power to operate |
Speed |
Data transfers at the rate of up to 6 Gb/s |
Data transfers at the rate of up to 6 Gb/s, but generally faster than SATA. If a Dual Port SAS connection is used then transfer speeds will be 2 x 6Gb/s. |
Data cable |
Narrow, can be up to a meter (roughly 3ft) long. Power and data split into two connections. |
Can be up to 10m (33ft) long. Power and data fused into one connection. |
Uses |
Personal computing, storage. |
Enterprise, servers. |
Speed over Capacity |
SATA prioritize on Capacity |
SAS prioritize on Speed |
Reliability |
700,000 hours - 1.2M hours at 25 °C, may fail after long period of use |
1.2M - 1.6M at 45°C , Can be use 24/7 |
Price |
The SATA equivalent is about 10% cheaper at $87 |
1TB 7200 rpm SAS drive goes for about $100 |
diffen.com SATA_vs_Serial_Attached_SCSI
Quora Difference Between SATA And SAS Points
1.
SATA or Serial ATA stands for Serial Advanced Technology Attachment and is the
next generation computer bus interface from the parallel interface ATA. SAS, or
Serial Attached SCSI, is a faster and historically more expensive interface.
2. SATA is for general use while SAS is for high-end server
hardware
3. SATA is way cheaper than SAS
4. SATA uses ATA commands while SAS uses SCSI commands
5. SAS has better error reporting and recovery than SATA
6 .SAS can use longer cables than SATA.SAS can support
cables up to 8m long, while maximum cable length for SATA is 1m.
7. SATA drives can be used in SAS backplanes but not the
other way around
8. SAS is designed for mission-critical enterprise
applications whereas SATA is a general-purpose interface common in the consumer
market.
9. SAS supports multiple initiators, while SATA has no such
provision.
10. SAS is dual ported where as SATA is single ported. SAS
is therefore capable of multi path I/O without additional hardware. Moreover,
SAS can make use of both ports to scale performance.
11 SATA transfers data at half duplex while SAS can transfer
data at full duplex. Thus, for SAS, each port can read and write data at the
same time whereas SATA cannot.
12. SAS uses SCSI commands for error recovery and error
reporting, which have more functionality than the ATA command set used by SATA.
Shivam Difference-between-SATA-and-SAS
Why SATA is better for storage
Read/write speed
SATA works best when data is being transferred into the storage drive. It works at a slower pace when it transfers data out of the storage drive.
For that reason, SATA is a great technology to have in your computer if you’re storing information that you don’t need to use on a regular basis. So if you’re storing lots of data on your PC or on an external drive, consider getting a PC or drive that’s built with SATA components.
Storage capacity
SATA has a very large storage capacity, and that’s another reason why it makes for a great component in your PC or external drive.
Price
SATA hardware is less complex than SAS hardware, so it tends to be less expensive. That means that PCs and external drives that utilize SATA technology also tend to be less expensive .
Why SAS is better for servers and workstations
SAS is great for 2 purposes:
- Servers
- Workstations
If you’re setting up a server for use by your office complex or small business, get servers and hard drives that use SAS technology. SAS is also a good component to have in your computer if you use your computer for processing-intensive work, like video editing, visual effects creation, or animation.
Read/write speed
SAS is an all-around faster technology than SATA because it transfers data out of storage just as quickly as it transfers data into storage. Servers and workstations rely heavily on data transfer, so it’s good to have hardware that can send and receive information at a fast pace.
Storage capacity
SAS doesn’t have a storage capacity that’s as large as SATA, but it doesn’t need to. Servers utilize several different hard drives, so they’ll have the collective storage capacity of all the hard drives. And most creative professionals use multiple hard drives, anyway.
Price
SAS hardware is more complicated, and that makes it more expensive. On the bright side, SAS hardware is more durable than SATA. The MTBF (mean time before failure) of SATA is 1.2 to 1.6 million hours. That means that SATA tech is likely to run for well over a million hours before it needs to be replaced.
Smart tech
SAS is built with integrated technologies that make it especially useful for servers and workstations. Hard drives that are built with SAS connectors are cased in “SCSI enclosures.”
A SCSI enclosure is a piece of hardware that helps your hard drive manage the traffic that’s coming and going through the SAS highway. If there’s an error in the hardware, the SCSI enclosure programming can find it and report it.
What is RAID?
The SCSI programming uses RAID to protect you from data loss. When you’re working with data that hasn’t been saved to storage, SCSI ensures that all data exists on multiple drives, so that if one drive fails, the data will still exist on another.
This process is called RAID (Redundant Array of Independent Disks). You can perform RAID on SATA technology, too, but it’s more efficient on SAS technology because SAS links more circuitry. Servers and workstations conduct so many transfers of temporary data that having RAID-capable technology is a necessity .
One final capability of SAS is that it allows for multipath input/output (I/O). Since SAS technology usually connects more than one piece of circuitry, it can reroute data through a secondary highway if the primary highway fails. This is an important feature to have in very large interconnected systems, like servers .
SSD performance for SAS and SATA
There are 2 main types of hard drives:
- Hard disk drive (HDD)
- Solid-state drive (SSD)
A hard disk drive looks a little bit like a record player. There’s an actuator arm that uses electromagnetism to write data onto a rotating platter. A solid-state drive has no moving parts, and uses small chips to store data instead.
Which one is better? HDDs usually have more storage space, but SSDs are faster. An HDD must wait for the platter to rotate to the correct location before it reads or writes data. An SSD doesn’t have any moving parts that it needs to align, so its read/write speeds are uniformly faster.
Both SSD SAS drives and SSD SATA drives are faster than their HDD counterparts. They have the same characteristics though: SATA is still faster writing data, while SAS is faster at reading and writing data continuously.
Zach Cabading. sas-vs-sata
FAQs Related To SAS vs SATA
What is better SAS or SATA?
SATA devices offer significantly higher storage capacity, and SAS-based hard drives are more reliable and quicker than SATA-based hard drives. And drives used for servers are SAS drives as they are fast and dependable. And SATA drives are used for home computers as they are less expensive.
Is SAS same as SATA?
Both technologies roughly do the same things. However, they are created on distinct hardware. SAS is more costly, and it’s better suitable for servers usage or workstations with a lot of processing power. SATA is less costly, and it’s better for storing files on a desktop.
Can a SAS drive be connected to SATA?
Both use the same infrastructure and have similar functionality, allowing SATA hard drives to be used with SAS controllers. SAS controllers allow SATA drives to be plugged in, whereas SAS drives can’t be plugged into the SATA controllers.
Why are SAS drives more expensive?
The SCSI storage protocol contains more advanced directives for improving data transmission from drives to controllers and vice versa. This boost in efficiency would make an otherwise identical SAS drive intrinsically quicker than a SATA drive, especially under heavy workloads; nevertheless, it would also raise the cost.
SAS vs SATA: In Tabular Form
Basis For Comparison |
SAS |
SATA |
Stands For |
Serial Attached SCSI / Serial Attached Small Computer System Interface |
Serial ATA or Serial Advanced Technology Attachment |
Uses |
It uses in enterprise, servers |
It uses for personal computing, storage |
Speed |
It is faster than SATA and data transfers at the rate of 6 Gb/s. Also, if the SAS connection of dual-port is used, transfer speeds will be 2 x 6 Gb/s. |
In SATA, the data transfers at the rate of up to 6 Gb/s |
Speed over Capacity |
In SAS, it prioritizes speed over the capacity. |
In SATA, it prioritizes capacity over speed. |
Data cable |
SAS can be up to 10m (33ft) long, and the data and power are fused into one connections. |
It can be up to a meter (roughly 3ft) long, and the data and power are split into two connections. |
Price |
Approx. 100$ |
Approx. 90$ |
Reliability |
It can be used 24/7. |
After use for a long period, it may fail. |
Advantages |
Its data transfer rate is fast. It has a higher MTBF than SATA, longer cables, and sometimes higher rpm. |
SATA is inexpensive and has a large storage capacity. |
Disadvantages |
It is expensive and uses power to operate, and also it has less storage capacity. |
It has lower MTBF than SAS, and it is less suited for servers. |
SAS and SATA are two technologies that are used to transfer information from the motherboard to a storage drive. Each hardware is built differently.
SAS is optimal for use in servers and workstations because it has a more versatile array of connectors and is faster at reading and writing data in a continuous computer session. SATA is better for storage purposes because it can write data very quickly, and the hardware is budget-friendly for small businesses.
References
[1] BuildComputers.net; What is a Motherboard?
[2] ComputerHope; Binary
[3] Techopedia; Bus
[4] Scottish Qualifications Authority; Serial and Parallel Communication
[5] TechTerms; SATA
[6] EuroVPS; The Pros and Cons of SAS vs. SATA Storage (From a Hosting Provider’s Perspective)
[7] Diffen; SAS vs. SATA
[8] SearchStorage; RAID (redundant array of independent disks)
[9] WhatIs; Multipath I/O (MPIO)
[10] StorageReview; SSD vs HDD
- Do hard drives slow down with age? - Super User
- Does a full hard drive slow down your computer? - I teach 109
- Frequently Asked Questions Regarding Storage Configurations (PDF) - SAS Institute
- Power Consumption and Heat Dissipation of Enterprise Hard Disk Drives - iXBT Labs
- SAS and SATA Performance and Features Table - Intel
- SAS Drives: New Challenges in Recovery Processes - DeepSpar Data Recovery
- SAS Reliability Advantages for the Developer - SCSI Trade Association
- SAS/SATA Cables Guide - Serve the Home
- Serial ATA (SATA) Definition - About.com PC Support
- What Drive Should I Buy? - Backblaze
- What is false disk failure, and why is it a problem? - LSI Blog
- Wikipedia: Hard disk drive#Performance characteristics
- Wikipedia: Serial ATA
- Wikipedia: Serial attached SCSI
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