Check the system information app for more details including about usb devices connected to usb ports on your mac.
Usb power saving mac.
Click the power management tab.
Bus powered devices get power from the device they re plugged into such as your mac.
After several hours of sleep your mac can save more energy by saving its state to the startup disk then turning off power to some components such as ram.
However sometimes the usb port does not get turned back on when it is needed or is inadvertently turned off.
By default windows enables the power saving feature all usb ports known as usb selective suspend.
Use your device as a self powered device or connect it to a powered usb or thunderbolt 3 usb c hub if possible.
Self powered devices get power from an electrical outlet or their own battery.
Connect the usb flash drive or other volume that you re using for the bootable installer.
Open terminal which is in the utilities folder of your applications folder.
Or check it to let windows turn off usb ports to save power.
This feature is supposed to save power by shutting down usb ports that are only used intermittently.
Type or paste one of the following commands in terminal.
It is your responsibility as an apple user to optimize the power settings on your computer.
You can use the following instructions to change your selected power settings.
Make sure that it has at least 12gb of available storage and is formatted as mac os extended.
In our tests the ssd appears to have used less power than the 3 5 inch 7200 rpm hard drive in the imac but a bit more power than the 2 5 inch 5400 rpm hard drive found in the stock.
Choose apple menu about this mac click support then click specifications.
If you want usb ports to keep supplying power in sleep mode just uncheck allow the computer to turn off this device to save power.
This extends the length of time that mac notebook computers can stay asleep when using battery power.
Get the best performance from your usb devices.
Community network does not push power profiles or power settings to apple computers.