The following symptoms may mean connecting to a Mac? USB-A？ , USB-C or Thunder 3 (USB-C)? The device on the port is not getting enough power:

Displays a message that the device needs more power, the operation cannot be completed, or the USB device has been disabled, and you need to unplug the device that consumes too much power.

Operations that consume a lot of power cannot be performed. For example, writing to a disk requires more energy than reading from a disk.

Mac can't open or recognize the device.

solution

If possible, use your device as a self-powered device or connect it to an active USB or Thunderbolt 3 (USB-C) hub.

Self-powered devices get power from power outlets or their own batteries. Bus powered devices get power from connected devices (such as Mac).

Reduce the number of bus-powered devices connected to the Mac, or use more such devices as self-powered devices to reduce the total power that the Mac needs to provide.

If your device is connected to another device (such as a monitor or a multi-port converter) as part of a device chain, the other device may not be able to provide enough power or transmit enough power from the Mac. In this case, please connect your device directly to the Mac.

When connecting a device to a port on a Mac with a cable, make sure that the port and cable support it? The USB specification is not lower than the USB specification supported by the device. For example, if a device specially designed to support the USB 3 specification is connected to a USB 2 port or cable, the device may not get enough power.

If the cable you are using is damaged or defective, please try another cable. If the converter is used with the cable, the cable may be damaged or defective.

If your Mac is equipped with multiple Thunderbolt 3 ports, please connect your device to the Thunderbolt 3 port farthest from the current port. For example, if your device was previously connected to the port on the left side of the MacBook Pro, please connect it to the Li Lei 3 port on the right side now. ?

If you have software that can be updated on your device (for example, drivers or firmware), make sure that the device uses the latest software provided by the manufacturer. To get firmware updates for Apple accessories, please update your Apple software.

Make sure your Mac is awake and booted from the Mac operating system. Some Apple devices can only get extra power when the Mac wakes up and boots from the macOS.

Learn more about USB power on your Mac.

System Information provides more detailed information about the USB power supply on the Mac. Please connect the USB device directly to the Mac, and then select "USB" from the sidebar of the system information. For each USB device, the system information displays the following information:

Available current: the default power supply provided by the port to which the device is connected.

Required current: the power required by your equipment.

Additional working current: Mac computers and Apple monitors introduced after 2006 can provide additional power through one or more ports after directly connecting some Apple devices (such as iPhone or iPad). The Mac or monitor must be turned on and woken up to provide extra power. Mac booted from Windows operating system can't provide extra power.

Please click to enter a picture description.

Understand the power supply provided by each USB specification, such as USB 2 and USB 3.