Apple computers equipped with USB 3 provide up to 900 mA (milliamps) at 5 V (Volts) to most Apple USB peripherals as well as all third-party USB peripherals that comply with USB specifications. Apple computers and displays equipped with USB 1.1 or USB 2 provide up to 500 mA (Milliamps) at 5 V (Volts) to most Apple USB peripherals as well as all third-party USB peripherals that comply with USB specifications. Some USB peripheral devices not manufactured by Apple might have unique power requirements that exceed the power allotment on an individual USB port. These devices might require you to connect them to multiple USB ports or might have external power sources that must be connected for them to function. Apple peripheral devices might request more than 500 mA (Milliamps) at 5 V (Volts) from a port to function or to allow for faster charging.

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These devices include: • Apple MacBook Air SuperDrive (when connected to supported computers) • Aluminum Wired Keyboard* • iPod • iPhone • iPad Some Apple computers and displays** can provide up to 1100 mA at 5 V through the port the Apple device is connected to. This power is available under certain conditions: • An Apple device must be plugged directly into an Apple computer or display. Apple devices connected to hubs won't have access to extra power above the standard USB specification of the port the device is connected to. • Your Apple computer or display must be powered on and be awake. If it's asleep, all ports provide their normal maximum output.

• The port providing extra power is determined by the first Apple device to connect to the Apple computer or display that requires extra power. The remaining ports continue to offer their normal maximum output. Some Apple computer and displays offer the ability to operate more than one USB port at 1100 mA at 5 V. On those computers, the second or third port is enabled when an appropriate device is connected. • An Apple computer started up to Windows via BootCamp doesn't provide extra power.

*When connected to a computer that supports a connection of 1100 mA at 5 V, the first port on the keyboard to have a device or peripheral connected to it that requests standard 500mA power receives that power. At that point, 100 mA at 5 V is available through the remaining port on the keyboard. The keyboard doesn't support extra power out of its two ports simultaneously; it requests extra power from the host computer to provide power out of either one of its two ports, then the second keyboard port receives the standard 500mA. **Apple computers and displays that were introduced before 2007 support only 500 mA at 5 V from their ports and don't offer additional power. You can use to find more information about peripheral power requirements, or you can contact the manufacturer of your peripheral.

For the most accurate information about power usage, make sure your device is connected directly to your Apple computer or display before you open System Information. To open System Information, hold down the Option key and choose Apple menu () > System Information. Andrea sb-805b software for mac. You can also use to find System Information, or open it from the Utilities folder of your Applications folder. In the example above, the USB port offers the default 500 mA, as shown in the Current Available (mA) entry. The Current Required (mA) entry indicates the current the device needs to operate. Extra Operating Current (mA) indicates that this USB port is providing an additional 1600 mA for use with the device. Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement.