This articles describes Xbox One system requirements for external storage drives and what to do if your console can’t detect a connected external drive.
For an external storage drive to work with Xbox One, it must meet the following requirements:
Use a USB 3.0 connection. If you’re using a USB hub, the hub must also be USB 3.0 or later.
Have 256 GB or larger storage capacity.
Have a partition. Typically, drives come with a preformatted partition. For information about partitioning an external hard drive if it doesn’t have a partition, refer to the manufacturer’s instructions.
Additionally, no more than two external drives can be connected to the console at the same time.
What to do if an external storage drive is not detected
If your external storage device meets the system requirements but isn’t detected by your console, try the following:
If this happens when your console’s power mode is set to “Instant-On,” try adjusting the power management for storage:
Go to the Home screen.
Press the Menu button on the controller.
Go to Power & startup.
Unselect the checkbox next to “When Xbox is off, turn off storage.”
Remove and then reconnect the drive.
Connect the drive to a different USB port on the console.
Perform a “full reboot” of the console:
Hold the power button on the front of the console for about 10 seconds.
Turn the console on again, and then try the external drive again.