What is Thunderbolt technology on a Mac?

Cables are often an inconvenient necessity, not glamorous but essential to our digital lives. Despite their secondary role in the tech world, cable technology – or input/output (I/O) technology – has had to evolve rapidly to keep up with the ever-growing demands of computers, televisions, smartphones, and other devices. So, what's next in I/O development? According to Apple and Intel, it's Thunderbolt, a collaboration between these two tech giants.

At first glance, Thunderbolt may seem similar to older technologies like USB, but its superior speed, simplicity, and versatility make it stand out. Initially named Light Peak, Thunderbolt can transmit both data and display signals over a single cable, while also delivering 10 watts of power to connected peripherals [source: Apple].

Additionally, Thunderbolt is compatible with other technologies. It's a dual-protocol system, meaning it can work with both PCI Express and DisplayPort – well-established standards for connecting computer components and external displays, respectively.

Thunderbolt is also incredibly fast. With a data transfer rate of approximately 10 Gbps, it’s twice as fast as USB 3.0, enabling users to transfer a high-definition movie from an external hard drive in just about 30 seconds [source: Intel]. Plus, users can daisy chain Thunderbolt peripherals, so devices like an external hard drive connected to a video capture unit that’s linked to a display can all share a single port on your computer.

Next, we’ll explore how Thunderbolt accelerates media transfer and address a few potential drawbacks.

Thunderbolt: Media Mover for the Masses?

Thunderbolt's speed and flexibility come from a few key innovations. The cables are built with multiple copper wires that allow data to travel both ways simultaneously. As Intel and Apple continue refining this data highway, these cables may switch to fiber-optic technology, boosting transfer speeds and enabling longer cable lengths. Additionally, Intel has created a custom chip that works with Thunderbolt technology to manage data flow between devices, while identifying and sorting different signal types. This allows various devices to share the same port, even though they may require entirely different signal formats.

Apple was so confident that the I/O system would shape the future of connectivity that it integrated Thunderbolt ports into all of its Mac models, from the high-end MacBook Pro to the entry-level Mac mini. This inclusion ensures that both beginners and expert Apple users have access to Thunderbolt, although the technology is particularly beneficial for resource-intensive tasks like video editing.

However, as with any new technology, it will take time for widespread adoption. As of August 2011, only a handful of compatible devices were available, including hard drive arrays from Pegasus and Apple’s own 27-inch (69-centimeter) Thunderbolt display. Nevertheless, because Thunderbolt connectors are the same size as mini DisplayPort connectors, DisplayPort monitors are compatible with Thunderbolt-enabled devices. Apple also offers various adapters that let users connect devices that use FireWire, HDMI, and other technologies to the Thunderbolt port.

Despite its promise, Thunderbolt has some drawbacks. Its peripherals and cables were initially quite expensive. For example, the cables were priced at $49, and Apple’s Thunderbolt display cost nearly a thousand dollars, about two to three times more than similar monitors from other brands. However, prices may drop as the technology becomes more widely adopted. Additionally, since Thunderbolt is based on PCI Express, it’s unlikely to be adopted by iOS devices, like the iPhone or iPad, which rely on a different technology.

If Thunderbolt gains traction, we can expect peripherals designed specifically to exploit its capabilities, while older devices reliant on previous I/O standards might start to appear outdated. Though it will take time for the technology to become commonplace, with the backing of the company that popularized USB, Thunderbolt has a very promising future.