Only Connect: Apple’s Thunderbolt Technology
Further to my previous Blog on the Apple Technology the following is a Q & A from Apple about their Thunderbolt interconnection technology which should go some way to help people understand the technology a little better.
1. What is the maximum bandwidth supported by Thunderbolt to Thunderbolt cable (2 m)?
Thunderbolt utilizes two separate 10Gbps links – one for displays and one for PCI-E device traffic – for throughput of up to 10 Gbps between Thunderbolt capable devices and your Mac. Some devices not made by Apple may support different bandwidth rates; consult any documentation that came with your Thunderbolt-enabled device for information specific to your device. Choose the Disk Activity tab in Activity Monitor to read current disk activity statistics, which may be helpful to determine disk activity with storage devices using Thunderbolt. Some storage devices may have a maximum transfer rate lower than the bandwidth potential of Thunderbolt.
The Thunderbolt symbol should be on the top of the connector. You can plug either end of the cable into a device or Mac; the connectors on each end are the same. Do not force the Thunderbolt cable into your Thunderbolt-capable device or Mac computer’s Thunderbolt port.
3. How do I confirm a Thunderbolt-enabled device is connected to a Mac?
Open System Profiler and examine the Thunderbolt tab for a list of any connected Thunderbolt devices.
4. Can I use a Thunderbolt cable to connect a Promise, La Cie, or other third-party storage device that uses Thunderbolt?
Yes. You can use a Thunderbolt cable to connect any Thunderbolt-enabled device or Mac.
5. Is there a maximum supported length for using Thunderbolt cables with Apple products?
Thunderbolt cables should not exceed two meters for maximum performance. Apple Thunderbolt to Thunderbolt cable (2 m) is two meters in length. Some Thunderbolt devices include an extra port you can use to connect other Thunderbolt devices downstream with additional Thunderbolt cables.
6. Why is there a black screen when I use a Thunderbolt cable to connect to an Intel-based iMac that supports Target Display Mode?
Although a Thunderbolt cable will fit into Mini DisplayPort connections, only Mini DisplayPort cables can be used in Target Display Mode with an iMac (Late 2009) or iMac (Mid 2010) connected to a Thunderbolt-enabled Mac; iMac models produced before 2011 do not support Thunderbolt cables or devices. If you have an iMac (Late 2009), make sure you have the 27-inch SMC iMac Firmware Update 1.0 installed to avoid issues waking from sleep in Target Display Mode.
7. What do I do if my Mac doesn’t have a Thunderbolt option in System Profiler and no connected devices seem to be recognized?
For Mac computers with Thunderbolt, run Software Update to install any available updates to use Thunderbolt devices with your Mac.
8. I’ve installed all available updates, but no Thunderbolt devices are recognized when I connect them with Thunderbolt to Thunderbolt cable (2 m).
Try using a different a Thunderbolt cable, using a Mini DisplayPort cable, or – in the case of a storage device – try using another supported connection method, such as USB or FireWire.
9. Can I use Target Disk Mode with a Thunderbolt to Thunderbolt cable (2 m) and a third-party storage device that uses Thunderbolt?
Yes. The Thunderbolt logo should appear with the FireWire logo when you start up a Thunderbolt-enabled Mac and have a Thunderbolt storage device connected. If you have both a Thunderbolt and a FireWire storage device connected and enter Target Disk Mode, the Thunderbolt-enabled device will be the default. If you disconnect either a Thunderbolt or FireWire storage device after successfully entering Target Disk Mode, the corresponding icon should disappear from the display.
10. Can I use Thunderbolt to Thunderbolt cable (2 m) with supported versions of Microsoft Windows on a Thunderbolt-capable Mac with Boot Camp?
Yes. Learn more about using Thunderbolt with your Mac running Windows with Boot Camp.
Previous Only Connect entries: