What Does SATA 6Gb/s Mean?

SATA 6Gb/s is the third-generation of SATA, the predominant interface standard for connecting a computer’s host bus adapter to data storage drives. Specifically, SATA 6Gb/s ports are used to connect the motherboard to data storage units such as hard drives, solid state drives, and optical disc drives. Although the terms are technically incorrect, SATA 6Gb/s is sometimes referred to as SATA III or SATA 3.0, as it is the third revision of the SATA interface.

SATA stands for “Serial ATA” or “Serial Advanced Technology Attachment.” The “6Gb/s” refers to the fact that this SATA version supports maximum data transfer speeds of 6 gigabits per second, which is twice the speed of the previous generation (3 gigabit per second). Regardless of their generation, SATA cables have a maximum length of one meter (3.3 feet) and connect a motherboard socket to a single hard drive.

When it was introduced in 2000, SATA technology changed the landscape of hard drive technology by switching from wide Parallel ATA (PATA) data cables and connectors to narrow serial cables and connectors, paving the way for faster speeds than parallel technology could handle. The use of SATA cables also physically reduced obstructions inside computer cases, thus allowing for greater air flow, faster computer processing units (CPUs), and higher capacity disk drives.

Other advantages over PATA include more efficient data transfer, lower power requirements, and greater affordability, as SATA requires far fewer conductors than PATA. Unlike PATA, SATA also features hot plugging, allowing computer users to add or remove devices while the computer is running. SATA has now replaced PATA in nearly all laptop and desktop computers.

As previously mentioned, SATA 6Gb/s is fully compatible with previous generations of SATA technology, including motherboards that support the SATA 3Gb/s or SATA 1.5 GB/s interface. However, you should be aware that the maximum read and write speeds of a SATA 6Gb/s drive are likely to be reduced when connected to a SATA 3Gb/s or SATA 1.5 Gb/s port.

In some cases, you may be able achieve comparable transfer speeds with both SATA 6Gb/s and SATA 3Gb/s cables. Sometimes, the quality of the cable and the materials used may be just as important as the SATA specification.

As a popular and ubiquitous interface meant to connect a computer’s host bus adapter to data storage drives, SATA is the predominant way to attach a multitude of devices to a computer motherboard. Motherboards that use SATA often come packaged with SATA cables, and they can also be purchased separately.

SATA is the common interface used for both solid-state drives and hard disk drives, as well as optical disc drives.

SATA stands for Serial ATA or Serial Advanced Technology Attachment.

The first variety of SATA came about in 2000. The first revision was called SATA 1.5 Gb/s and came about in 2003. As you might safely guess, it had a native transfer rate of 1.5 Gb/s. It was designed as an alternative to PATA, or Parallel ATA.

SATA 3 Gb/s came about soon afterward in 2004, doubling the native speeds of the previous version. SATA 3 Gb/s was backward compatible with SATA 1.5 Gb/s, so you didn’t need a new motherboard if you were still using devices designed for SATA 1.5 Gb/s. One special feature that SATA 3 Gb/s had was Native Command Queuing, which allowed the drive to prioritize read and write commands. In the previous version, these requests were always done in the order in which they were assigned.

In 2009, the third version of SATA came out: SATA 6 Gb/s, which doubled the native transfer speeds again and added new NCQ features, and improved performance for demanding tasks such as video streaming. This third revision is sometimes called SATA III, though the Serial ATA International Organization prefers this term not to be used so as not to cause confusion between SATA III and SATA 3 Gb/s. SATA 6 Gb/s was backward compatible with both previous versions of SATA. You could use a SATA 6 Gb/s interface with a SATA 1.5 Gb/s device, though the transfer speeds would be throttled to 1.5 Gb/s. If you wanted 6 Gb/s speeds, you needed both the interface and device to be compatible with the 6 Gb/s versions.

It is sometimes possible to get improved speeds despite the different interfaces if the quality of the cable is high enough. The attributes and materials used in the cable can sometimes be more important than which version of SATA is being used.

Hard disk drives typically do not need anything higher than SATA 3 Gb/s to function at maximum speed. Modern hard disk drives typically don’t support read speeds higher than 200 Mb/s. SATA 3 Gb/s supports read speeds of up to 300 Mb/s, so a 3 Gb/s interface should work well.

SSDs have considerably faster data transfer speeds than traditional hard disk drives, so you may wonder whether you will see a noticeable difference with newer versions of SATA. The answer is: Not usually. A SATA 3 Gb/s interface is usually perfectly adequate for use with an SSD, and a normal user is unlikely to take advantage of the extra bandwidth in a 6 GB/s interface. Thus, if your motherboard only supports SATA 3 GB/s and you want to use an SSD, you will probably not need to upgrade.

However, if your SSD is designed for SATA 6 Gb/s, you may not be getting optimal speeds with a 3 Gb/s interface. Check with the SSD manufacturer if you’re not sure which version you should use, or just use a 6 Gb/s interface to be safe.

Generally, all versions of SATA are adequate for optical drives, whether your optical drive is designed for Blu-ray, DVD, or CD. None of these drives have particularly high read and write transfer speeds even at their maximum speed.

SATA and PATA cables look vastly different on the outside, with SATA cables being far narrower thanks to their needing fewer conductors on the connector. By comparison, PATA cables are thick and bulky, which took up valuable space in a computer case and trapped heat. Because SATA cables were able to reduce heat in a computer case, faster CPUs and higher-capacity disk drives could be installed safely.

On the inside, SATA cables have lower power requirements and better efficiency during data transfers. Finally, the SATA interface is less expensive than PATA.